15 Best Dual-Flush Retrofit Kits to Upgrade Your Toilet Efficiency

If you’re looking to upgrade your toilet for better water efficiency, I recommend exploring popular dual-flush retrofit kits like the Fluidmaster PRO550K, DuoFlush, and Danco HydroRight. These kits easily install without full tank replacement, often fitting most 2-inch flappers and tank sizes, and they help save water while maintaining performance. To pick the right one, consider compatibility, durability, and adjustability—I’ll share more helpful tips if you keep exploring.

Key Takeaways

• Compatibility with standard 2-inch flapper valves and various toilet models ensures easy retrofit installation.
• Features like adjustable flush volumes and durable silicone seals maximize water savings and long-term performance.
• Many kits meet WaterSense and ADA standards, promoting efficiency, accessibility, and eco-friendly operation.
• Installation is typically quick and tool-free, often under 10 minutes, ideal for DIY upgrades.
• Material durability, leak-proof seals, and calibration options enhance reliability and customized flushing performance.

FLUIDMASTER PRO550K Fluidmaster Pro Dual Flush Retrofit Kit

If you’re looking to upgrade your toilet to save water without replacing the entire fixture, the Fluidmaster PRO550K Dual Flush Retrofit Kit is an excellent choice. It easily snaps into existing 2-inch flapper valves, making installation quick and hassle-free—no tank removal needed. The kit features a durable silicone seal that minimizes flapper replacements and a calibrated Pro fill valve for consistent flushing. Its lever allows for liquid or solid waste flushing, and the cable system prevents chain tangles. Made of silicone, it’s compatible with standard inlet and outlet connections, meets WaterSense standards, and offers a straightforward way to boost your toilet’s efficiency.

Best For: homeowners and DIY enthusiasts looking to upgrade their toilet’s water efficiency quickly and easily without replacing the entire fixture.

Pros:

• Easy installation that snaps into existing 2-inch flapper valves, no tank removal required
• Durable silicone seal reduces the frequency of flapper replacements
• Calibrated Pro fill valve ensures consistent and reliable flushing performance

Cons:

• Limited to toilets with compatible 2-inch flapper valves, may not fit all models
• Some users might find the dual flush lever less intuitive initially
• Slightly higher price point compared to basic flappers and fill valves

Fluidmaster DuoFlush Fill and Dual Flush Conversion System

The Fluidmaster DuoFlush Fill and Dual Flush Conversion System is an ideal choice for homeowners looking to upgrade their existing toilets to conserve water without replacing the entire unit. It transforms standard 2-inch flush valve toilets into dual flush models, saving up to 45% water. The system includes a dual-action handle, fill valve, and adjustable settings for full and half flushes, all without removing the valve. Made from durable plastic with chrome and beige finishes, it’s compatible with various toilet models and meets ADA and WaterSense standards. Easy to install and adjust, it improves performance, reduces noise, and helps lower utility bills.

Best For: homeowners seeking an easy, cost-effective way to upgrade their existing toilets for water conservation without complete replacement.

Pros:

• Converts standard toilets to dual flush, saving up to 45% water
• Easy to install and adjust without removing the entire valve
• Compatible with a wide range of 2-inch flush valves and meets ADA and WaterSense standards

Cons:

• May require some basic plumbing knowledge for installation
• Not suitable for toilets with non-standard or proprietary flush valves
• The system’s plastic components might be less durable over many years compared to metal parts

Danco HydroRight Universal Toilet Repair Kit

The Danco HydroRight Universal Toilet Repair Kit stands out as an ideal choice for homeowners seeking an easy and cost-effective way to upgrade their standard toilets to water-saving dual flush systems. It converts your existing toilet with a dual-flush handle, allowing for quick flushes for liquids and paper, and full flushes for solids, reducing water consumption. The kit includes a dual-flush converter and a fill valve, ensuring efficient operation and leak prevention. Installation is simple, taking just 5-10 minutes without tools or tank removal. Its durable silicone seal guarantees a leak-proof fit, making it a reliable, eco-friendly upgrade for compatible toilets.

Best For: homeowners looking to easily and affordably convert their standard toilets into water-saving dual flush systems without extensive repairs or tank removal.

Pros:

• Quick and tool-free installation in just 5-10 minutes.
• Durable silicone seal ensures leak-proof, long-lasting performance.
• Promotes water conservation with adjustable water volume and dual-flush functionality.

Cons:

• Not compatible with Mansfield toilet models.
• Requires a minimum 10-inch clearance from the top of the flush valve to the tank lid.
• Does not include the toilet tank or handle, only the conversion components.

3-Inch Dual Flush Valve Replacement Kit for 2-Piece Toilets

Designed specifically for 2-piece toilets with tank heights between 10 and 13 inches, this 3-inch dual flush valve replacement kit offers a reliable upgrade to improve flushing performance and water efficiency. It includes a flush valve with a 1.9-thread push button, a fill valve, gasket, and bolts, making installation straightforward with just a screwdriver. Crafted from durable ABS and PP materials, it minimizes leakage with a thick rubber seal. The kit features adjustable components and a double-flush mode, allowing you to choose between half or full flushes, helping conserve water while delivering effective flushing power. Verify your tank dimensions for ideal fit before installation.

Best For: homeowners or DIY enthusiasts seeking a reliable, water-efficient upgrade for 2-piece toilets with tank heights between 10 and 13 inches.

Pros:

• Easy installation with complete accessories and minimal tools required
• Durable construction from ABS and PP materials that minimizes leakage
• Adjustable components and double-flush feature for customized water savings and efficient flushing

Cons:

• Compatibility depends on verifying tank dimensions; may not fit all models
• Installation may be challenging for those unfamiliar with toilet components
• May require additional tools or modifications for certain toilet types

2-Inch Dual Flush Valve Replacement Kit for Toilets

If you’re looking to upgrade your toilet with a reliable, easy-to-install dual flush valve, the Inch Dual Flush Valve Replacement Kit is an excellent choice. It fits most 2-inch, one-piece toilets with tank heights between 10-13.5 inches, provided the drain hole is 2.55-2.85 inches and the tank lid hole measures 2.2-2.6 inches. The kit includes a durable ABS flush valve, fill valve, rubber seal, and a threaded button, all designed for quick installation—usually in under 10 minutes with just a screwdriver. It offers full and half flush modes, adjustable water levels, and enhances efficiency without sacrificing power or reliability.

Best For: homeowners and DIY enthusiasts seeking a quick, reliable upgrade for their one-piece, 2-inch dual flush toilets to improve water efficiency and flushing performance.

Pros:

• Easy installation in under 10 minutes with minimal tools required
• Compatible with most 2-inch drain and tank lid hole sizes
• Includes adjustable water level and rubber seal to prevent leaks

Cons:

• Only fits toilets with specific height and drain hole dimensions
• May require additional fittings if existing components differ
• Limited to 2-inch flush valve models, not suitable for larger or different sizes

2 Inch Toilet Flush Valve Repair Kit for Dual Flush Toilets

A 2-inch toilet flush valve repair kit is an excellent choice for homeowners looking to restore or upgrade their dual-flush toilets with minimal hassle. Designed for 2-piece models with top push buttons, it fits drainage holes from 2.36 to 2.76 inches and tanks up to 12.8 inches high. Compatible with brands like TOTO, Glacier Bay, and Aqua Source, it features adjustable water levels for efficient flushing. Made from durable ABS and silicone washers, it’s easy to install in under 10 minutes. Many users praise its quick setup and reliable leak prevention, though proper adjustments are key to ensuring ideal performance and water savings.

Best For: homeowners seeking an easy-to-install, reliable dual-flush toilet repair kit to improve flushing performance and water efficiency.

Pros:

• Quick and simple installation in under 10 minutes
• Adjustable water levels for optimal flushing and water savings
• Durable construction with silicone washers and ABS material for longevity

Cons:

• Proper adjustment of float and arms is necessary for best performance
• Some users report minor noise or abrupt flushing compared to original parts
• Quality consistency may vary, leading to potential leaks or operation issues over time

2-Inch Dual Flush Valve Repair Kit for One Piece Toilets

The Inch Dual Flush Valve Repair Kit for One Piece Toilets is an excellent choice for homeowners seeking an easy, reliable upgrade to their existing toilet’s flushing system, especially if their toilet has a 2-inch drain hole. This kit fits most one-piece top-flush toilets with drain holes measuring 2.44 to 2.83 inches. It includes a durable ABS and PP plastic drain valve, an adjustable fill valve, and a customizable push button. With simple screwdriver installation, it offers dual-flush functionality to save water by choosing half or full flush modes. Overall, it’s a practical, cost-effective solution that enhances toilet performance and water efficiency.

Best For: homeowners with one-piece top-flush toilets featuring 2.44 to 2.83-inch drain holes seeking an easy, reliable dual-flush upgrade.

Pros:

• Compatible with most one-piece top-flush toilets, making installation straightforward
• Includes adjustable fill valve and push button for customized operation and water savings
• Made of durable ABS and PP plastics with a thick rubber seal to minimize leaks

Cons:

• Customer ratings are average at 3.0 out of 5 stars, indicating mixed reviews
• Does not include batteries, though it features adjustable components that may require fine-tuning
• The first available date is scheduled for May 27, 2025, which may delay immediate purchase or replacement

R&T Dual Flush Valve with Push Button for 2-Piece Toilets

Designed specifically for two-piece toilets, the R&T Dual Flush Valve with Push Button offers a reliable and efficient replacement for worn-out flush valves. It features a 2-inch drain outlet and a convenient top push button for easy operation, providing both full and half flush options to improve water savings. Made of durable chrome ABS, it fits tanks with a 1.5-inch mounting hole and includes adjustable components to accommodate tank heights from 11.33 to 15.27 inches. Easy to install without tools, it works seamlessly with R&T’s fill valve and other components, restoring your toilet’s flushing power while reducing water bills.

Best For: homeowners or maintenance professionals seeking a durable, easy-to-install dual flush valve replacement for two-piece toilets to improve water efficiency and flushing performance.

Pros:

• Easy to install without tools, saving time and effort
• Adjustable components fit a range of tank sizes (11.33-15.27 inches)
• Durable chrome ABS construction ensures long-lasting use

Cons:

• Not compatible with one-piece toilets, limiting its application
• Fill valve, gasket, and bolts are sold separately, requiring additional purchases
• Proper measurement of flush valve size is necessary to ensure fit, which may be inconvenient

2-Inch Dual Flush Valve Repair Kit for 2-Piece Toilet

If you’re looking to restore your 2-piece toilet’s flush performance without replacing the entire unit, the Inch Dual Flush Valve Repair Kit is an excellent choice. It fits most 2-inch toilets from brands like American Standard, Glacier Bay, and Kohler, with easy installation in under 10 minutes. Made from durable ABS plastic, it includes a gasket, threaded button, and bolts, ensuring a leak-free, adjustable dual flush for water savings. The kit’s compatibility depends on your drain hole and tank dimensions, so verifying your measurements is essential. Customers praise its effectiveness, easy setup, and cost savings, making it a reliable upgrade for your toilet.

Best For: homeowners and DIY enthusiasts seeking an easy, cost-effective upgrade to restore their 2-piece toilet’s flush performance without full replacement.

Pros:

• Easy installation in under 10 minutes with no tools required
• Durable ABS plastic construction ensures longevity and leak resistance
• Adjustable flush modes promote water savings and efficient cleaning

Cons:

• Compatibility depends on specific tank and drain hole dimensions, requiring measurement verification
• Some users reported leaks due to gasket sizing issues if not properly fitted
• May not fit all 2-inch toilets, limiting universal applicability

Ulinlo Pouly 3-Inch Toilet Repair Kit

The Ulinlo Pouly 3-Inch Toilet Repair Kit stands out as an ideal solution for homeowners seeking an easy and cost-effective way to upgrade their toilet’s flushing system. It features water-saving technology with dual-flush options, reducing water usage without sacrificing performance. The heavy-duty valve ensures strong, clog-resistant flushing, while adjustable fill and overflow valves allow precise control. Compatible with major brands like American Standard, Kohler, and TOTO, it’s simple to install with detailed instructions and all necessary accessories included. This kit offers reliable operation, conserving water and lowering bills, making it a smart investment for upgrading your toilet efficiently.

Best For: homeowners looking for an easy, cost-effective upgrade to their toilet’s flushing system that conserves water and enhances performance.

Pros:

• Incorporates water-saving dual-flush technology to reduce water bills
• Compatible with major brands like American Standard, Kohler, and TOTO
• Easy DIY installation with all necessary accessories included

Cons:

• Designed specifically for 3-inch flush valve openings, limiting compatibility with some toilets
• May require adjustment for optimal performance in certain toilet models
• Does not replace the entire toilet, only the flushing components

3 Inch Dual Flush Valve Conversion Kit

The Inch Dual Flush Valve Conversion Kit is the ideal upgrade for homeowners looking to modernize and improve the efficiency of their 3-inch toilets. It replaces outdated flappers and chains, eliminating leaks and enhancing performance. Designed specifically for 3-inch discharge holes, it includes a handle, overflow water conserver, fill valve, and dual flushing options that cut water use by up to 50%. Made from durable plastic, it’s easy to install and compatible with NPT 3-inch connections. This kit not only reduces water bills but also minimizes clogs and maintenance, making your toilet more reliable and eco-friendly.

Best For: homeowners with 3-inch discharge toilets seeking to upgrade their flushing system for improved efficiency and water conservation.

Pros:

• Reduces water usage by up to 50%, saving on utility bills
• Replaces outdated flappers and chains, preventing leaks and enhancing reliability
• Easy to install with durable plastic construction and compatible NPT connections

Cons:

• Designed exclusively for 3-inch toilets; incompatible with 2-inch models
• Requires measuring toilet size accurately to ensure proper fit
• No batteries needed, but installation may require basic plumbing skills

3 Inch Dual Flush Valve Conversion Kit and Overflow Water Conserver

Designed for 3-inch toilets, the Inch Dual Flush Valve Conversion Kit and Overflow Water Conserver offers a straightforward way to upgrade your existing toilet into a water-saving dual flush system. It converts standard toilets to reduce water use by up to 50%, with adjustable controls for half and full flushes. The included Overflow Water Conserver redirects clean water back into the tank, helping it fill faster and saving water without sacrificing performance. Easy to install and operate, it features an ergonomic handle suitable for DIY projects. This kit is an efficient, eco-friendly upgrade that can lower your water bills and support sustainable water management.

Best For: homeowners seeking an easy, eco-friendly upgrade to their 3-inch toilets to save water and reduce utility bills.

Pros:

• Significantly reduces water consumption by up to 50% with adjustable flush controls
• Easy to install and operate, suitable for DIY projects without special tools or batteries
• Helps conserve water and lower environmental impact while extending the lifespan of existing toilets

Cons:

• Compatibility limited to 3-inch toilets; not suitable for other sizes or models
• Some users may experience minor leaks or installation challenges despite straightforward setup
• The product’s rating of 3.6 stars suggests mixed reviews, indicating potential room for improvement

Dual Flush Valve & Push Button Replacement Parts for Geberit & Kohler Toilets

If you’re looking to upgrade or repair your Geberit or Kohler toilet, this dual flush valve and push button replacement kit offers an easy, tool-free solution. It’s compatible with most 2-inch, two-piece toilets and includes everything you need—flush valve, top push button, and clear assembly instructions. Designed for split tanks with a 38mm top button, it’s straightforward to install in under 10 minutes. Made from durable ABS plastic, the parts resist wear and leaks. The dual modes allow water conservation with half flush or a stronger full flush. No batteries needed, and customer reviews praise its fit, ease of use, and leak-free operation.

Best For: homeowners or DIY enthusiasts seeking a quick, tool-free replacement for Geberit and Kohler toilets with reliable, water-saving dual flush functionality.

Pros:

• Easy installation in under 10 minutes with clear diagram instructions
• Compatible with most 2-inch, two-piece split tank toilets, including Geberit and Kohler
• Durable ABS plastic construction resists wear, leaks, and provides long-lasting performance

Cons:

• No textual instructions included, relying primarily on diagrams which may be challenging for some users
• Plastic push button with a shiny finish, not stainless steel, which may affect aesthetic preferences
• Requires tank removal for installation, which could be cumbersome for some users

2 Inch Dual Flush Valve Conversion Kit and Overflow Water Saver

For those looking to upgrade their toilet’s efficiency, the 2 Inch Dual Flush Valve Conversion Kit with Overflow Water Saver offers a straightforward solution. It includes a complete conversion kit, handle, and overflow water conserver, making installation simple. This kit can save up to 50% of water with two flush options, cutting down your water bills and environmental impact. It replaces outdated leaky flappers and chain systems, reducing maintenance. Plus, its adjustable water volume and powerful flush help prevent clogs, ensuring reliable performance. Overall, it’s an easy, effective way to boost your toilet’s efficiency and longevity.

Best For: homeowners and maintenance professionals seeking an easy, water-efficient upgrade for their toilet’s flushing system.

Pros:

• Saves up to 50% water, reducing bills and environmental impact
• Eliminates leaky flappers and chain issues for lower maintenance
• Adjustable water volume and powerful flush prevent clogs

Cons:

• Installation may require basic plumbing knowledge or tools
• Compatibility limited to toilets with a 2-inch flushing system
• Initial cost could be higher than standard replacement parts

5 Pack 2-Inch Dual Flush Valve Seal Washer Replacement Kits

The Pack 2-Inch Dual Flush Valve Seal Washer Replacement Kits are an excellent choice for anyone looking to quickly and reliably stop toilet leaks without replacing the entire flush valve. These 5-pack kits include durable rubber washers compatible with all 2-inch Geberit flush valves, ensuring a perfect seal. They’re easy to install and designed to withstand frequent use, helping restore your toilet’s efficiency while saving water. If you’re experiencing slow leaks or dripping, replacing worn-out washers is a simple, cost-effective solution. With a reliable performance rating of 4.5 stars, these kits offer peace of mind and long-lasting sealing for your toilet.

Best For: homeowners and DIY enthusiasts seeking a reliable, cost-effective solution to fix toilet leaks without replacing the entire flush valve.

Pros:

• Compatible with all 2-inch Geberit flush valves, ensuring a perfect fit.
• Made from durable rubber for long-lasting, reliable performance.
• Easy to install, ideal for quick DIY repairs and maintenance.

Cons:

• Not suitable for seals damaged beyond the gasket (e.g., cracked or broken flush valves).
• May require multiple replacements if leaks persist due to underlying issues.
• Installation requires proper fit; improper installation can affect sealing effectiveness.

Factors to Consider When Choosing Dual‑Flush Retrofit Kits

When choosing a dual-flush retrofit kit, I consider how well it fits my toilet model and how easy it is to install. I also look at its water-saving features, durability, and whether it offers adjustments for different needs. These factors help make certain I get a reliable, efficient upgrade that suits my bathroom.

Compatibility With Toilet Models

Choosing a dual-flush retrofit kit that fits your toilet model requires careful consideration of several key factors. First, check that the kit is compatible with your tank size, usually between 10 and 15 inches in height. Next, verify that the connection size matches your toilet’s inlet and outlet, typically 2 or 3 inches in diameter. It’s also important to confirm the type of flush valve—top-mount or side-mount—to ensure a proper fit. Additionally, some kits are universal, while others are designed for specific brands or models, so double-check compatibility. Finally, review installation requirements and available clearance space, like the minimum height from the flush valve to the tank lid, to prevent fitment issues. Being thorough here ensures a smooth upgrade.

Installation Ease and Method

Installing a dual-flush retrofit kit can be straightforward if you select one designed for easy setup. Look for kits that offer tool-free or minimal-tool installation, which speeds up the process and reduces frustration. Clear, step-by-step instructions with diagrams are essential to help you assemble everything correctly and avoid mistakes. Make sure the kit is compatible with your toilet’s valve size—whether 2-inch or 3-inch—to simplify the replacement. Some systems can be installed without removing the tank, saving time and preventing water spills or damage. Additionally, choosing kits with adjustable components, like fill and flush levels, allows for easy calibration during installation, ensuring ideal performance without complicated adjustments later.

Water Saving Capabilities

Dual-flush retrofit kits are an effective way to cut water usage and lower utility bills, often saving up to 45% of water per flush. They achieve this by offering two flush options—half and full—so you can choose the appropriate amount of water for each waste type. Many kits allow you to adjust water levels, helping you customize water consumption and prevent over-flushing. This flexibility guarantees efficient use during every flush cycle, reducing waste and conserving resources. Because they’re compatible with existing toilets and easy to install, these kits make water savings accessible without the need for a full toilet replacement. Proper calibration is key to maximizing water efficiency, preventing leaks, and ensuring each flush is as environmentally friendly and cost-effective as possible.

Material Durability and Quality

When selecting a dual-flush retrofit kit, paying attention to material durability and quality can make all the difference in its long-term performance. High-quality kits use durable materials like ABS plastic, silicone, or rubber, which resist wear and chemical damage over time. Corrosion-resistant components prevent rust and deterioration, ensuring the system stays reliable. Silicone seals and gaskets provide a leak-proof connection, minimizing water wastage and reducing repairs. Materials certified by FDA or WaterSense guarantee safety, non-toxicity, and environmental friendliness. Additionally, a well-made kit features reinforced joints and sturdy fittings that withstand daily use without compromising performance. Prioritizing these durable materials and high-quality construction guarantees your retrofit remains effective, leak-free, and long-lasting, making your investment worthwhile.

Adjustment and Customization Options

Choosing a retrofit kit with adjustable water level settings is essential for tailoring the flush volume to your toilet’s specific needs. Look for kits that feature adjustable flush valves or levers, so you can fine-tune the flushing strength for both half and full flush modes. Calibration options are also valuable, as they let you control water volume precisely, reducing waste and boosting efficiency. Consider systems that include adjustable overflow tubes or water conserver components, which help prevent overflows and allow further customization of water flow. Ease of adjustment is key—select kits with simple mechanisms like screw-based or sliding controls, so you can quickly and securely customize the settings without hassle. These features ensure your retrofit kit can be tailored for ideal performance and water savings.

Cost and Maintenance Factors

Considering the cost and maintenance factors is essential when selecting a dual-flush retrofit kit, as these aspects directly impact your long-term savings and ease of use. Prices vary from $20 to $100, depending on features and brand, so it’s important to choose one that fits your budget. Regular maintenance might involve replacing seals, flappers, or fill valves, which can add up over time. Kits made from durable materials like silicone or high-quality rubber tend to last longer and require less frequent repairs, lowering ongoing costs. Simpler installation designs usually need fewer adjustments and repairs, reducing maintenance efforts. Additionally, selecting kits with readily available spare parts makes ongoing maintenance easier and more affordable. Balancing initial cost with durability and ease of maintenance helps maximize your investment.

Frequently Asked Questions

Are Dual-Flush Retrofit Kits Compatible With All Toilet Brands?

Most dual-flush retrofit kits are compatible with a wide range of toilet brands, but not all. I recommend checking the kit’s specifications and your toilet’s make and model before purchasing. Some kits are designed for universal fit, while others are brand-specific. To avoid issues, I always measure and compare compatibility details carefully. If unsure, consulting the manufacturer or a plumber can save you time and guarantee a proper fit.

How Much Water Can I Save With a Dual-Flush Retrofit Kit?

You can save a significant amount of water with a dual-flush retrofit kit—up to 30-40% on your toilet’s water use. I’ve installed one and noticed a real difference, especially when choosing the lower-volume flush for liquids. It’s an easy upgrade that pays off over time, reducing your utility bills and conserving water. Plus, it’s simple to install and compatible with many toilet models.

Can I Install a Retrofit Kit Without Professional Help?

You can definitely install a retrofit kit yourself, and many find it straightforward. I’ve done it without professional help, following clear instructions that come with the kit. Just turn off the water, drain the tank, and carefully replace the old parts. Take your time, and don’t rush. If you’re comfortable with basic DIY tasks, installing a retrofit kit is achievable and saves you money on installation costs.

Do Retrofit Kits Affect Toilet Flushing Performance?

Yes, retrofit kits can affect your toilet’s flushing performance, but it depends on the quality and installation. If you choose a high-quality kit and install it correctly, you’ll likely see improved efficiency without sacrificing flushing power. However, cheap or poorly installed kits might cause weak flushes or clogs. I recommend selecting reputable brands and following installation instructions carefully to maintain ideal flushing performance.

What Is the Typical Lifespan of a Dual-Flush Retrofit Kit?

Like a trusty steed from the olden days, a dual-flush retrofit kit typically lasts between 5 to 10 years. I’ve found that with regular maintenance and gentle handling, you can prolong its life. Keep an eye out for leaks or decreased performance, and replace it as needed. Proper care ensures your investment continues saving water and money well into the future.

Conclusion

So, after exploring these retrofit kits, it’s funny how something as simple as a toilet can become a puzzle worth solving. You’d think upgrading efficiency would be straightforward, but here we are, weighing valves and seals like it’s a high-stakes game. Yet, in the end, isn’t it oddly satisfying to outsmart that old, stubborn toilet and save water—one tiny flush at a time? Who knew bathroom upgrades could be so thought-provoking?