The Toilet Tank 'Brick' Hack
Impact
Medium
Difficulty
Easy
Speed
Instant
If you have an older toilet, every flush is sending about 3.5 to 5 gallons of water down the drain. Modern toilets only need 1.2 to 1.6 gallons to do the same job. You can bridge that gap for free.
The trick is 'displacement'. By placing a heavy object in your toilet tank, you take up space that would otherwise be filled with water. A popular (but slightly risky) method is a brick, but bricks can crumble and damage the plumbing. Instead, fill a plastic bottle with pebbles or sand, seal it tight, and drop it into the tank away from the moving parts. Every time the tank fills, it uses less water—precisely the volume of the bottle.
This simple move can save an average family thousands of gallons of water a year. It's a low-tech way to upgrade an old fixture without the cost of a plumber. Just make sure the toilet still flushes effectively! If you find you have to flush twice, the bottle is too big. Find that 'Goldilocks' size, and enjoy the satisfaction of a cheaper water bill with every pull of the handle.
Quick Check Before You Try This
Use this tip as a practical starting point, then check whether it fits your home. The right answer can change with climate, utility rates, equipment age, household routines, and whether you rent or own.
| Check | Why it matters |
|---|---|
| Your actual bill | A high-impact tip in one home may be minor in another. |
| Equipment age | Older appliances and HVAC systems often waste more energy. |
| Comfort tradeoff | A good energy habit should not make the home harder to live in. |
| Safety or warranty limits | Electrical, HVAC, plumbing, and appliance work should stay inside manufacturer and code rules. |
For a broader next step, browse the EnergyBS guide library and compare this water tip with a full article before making a paid upgrade.