Yes, you can save about ½ gallon of water per flush by placing a brick in your toilet tank. However, all of the risk factors that accompany this method may not be worth it. Placing a brick in your water tank alters the total amount of water it holds, but toilets are manufactured to require a specific amount of water to flush properly. If the height of the water in your toilet tank is even slightly off, your toilet may not be able to complete the flushing process properly. This could result in trapped waste, as you may not have enough water in your tank to push waste into the sewer line. It could also cause sewer gasses to make their way into your bathroom.
Although placing a brick in your toilet tank poses many risks, there are thankfully quite a few other ways to use less water when flushing that are far safer. A similar solution is to fill a plastic bottle with small rocks or sand, seal it with a bottle cap, and place it in your toilet tank. It is important to note that this method only solves the problem of the disintegrating brick damaging your toilet and plumbing system. You will still run the risk of improper water volume in your toilet tank. Most plumbing professionals recommend simply upgrading to either a low or dual-flush toilet.
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