save water 100% free: convert single flush toilet to dual flush, and adjust single flush

Key Takeaways

• You heard me correctly: 100% free to convert your single flush toilet to a dual flush
• Your friends may have bought dual flush kits, but I am showing you the zero cost way, you don’t have to spend a penny
• Even if you don’t care about the dual flush method, you still should measure and adjust your single flush toilet
• Many people do not know they are wasting a lot of water
• Our own single flush used 2.5 gallons per flush, instead of 1 gallon or 1.5 gallons per flush

Understanding the Basics

A dual-flush converter replaces the standard flapper and flush handle with a two-button system. One button triggers a partial flush (typically 0.8 to 1.1 gallons), and the other triggers a full flush (the toilet’s standard 1.6 gallons). The mechanism works by controlling how long the flush valve stays open. The partial flush opens the valve briefly and then closes it, while the full flush keeps it open for the full drain cycle. The tricky part of installation is adapting the converter to your specific toilet’s overflow tube, which may have fins or protrusions that interfere with the converter’s seal.

The DIY Advantage

A dual-flush toilet from a store costs $200 to $500. A conversion kit costs $15 to $30 and installs in 30 to 60 minutes. The water savings typically pay for the kit within the first few months.

Tips for Best Results

Before installation, measure your overflow tube diameter and height to ensure the kit is compatible. If the overflow tube has fins or molded ridges, you may need to carefully trim them with a utility knife for the converter to seal properly. Test both flush modes multiple times after installation and adjust the water level as needed. If the partial flush is not clearing the bowl, increase the flush duration by adjusting the mechanism according to the kit instructions.

Video Chapter Guide

Here is a quick reference for the key sections covered in the video:

• 0:00 two tips
• 0:20 adjust single flush toilet
• 0:40 mark these 3 water levels
• 1:10 measure water wasted
• 1:57 liquid flush = 1 gallon
• 2:28 test
• 3:16 how to adjust
• 3:36 yellow float
• 3:59 refill valve black float
• 4:42 raise water level
• 5:24 verify both liquid flush & solid flush
• 6:07 must measure water flushed down

Use these timestamps to jump directly to the section most relevant to your situation.

More Practical Guides

Dual-flush conversion is one of the most cost-effective water-saving modifications you can make in your home.

For more hands-on tutorials, check out our guides on bathtub caulking and peeling garlic easily without special tools. Each one follows the same practical, no-nonsense approach to help you save money and build useful skills.