5 Things to Know About Using Household Bleach in a Pool

Household bleach kills algae and bacteria, but it’s weaker than pool shock. Most bleach is only 6% sodium hypochlorite, while pool shock is 10–12% or more. You need about twice as much bleach by volume for the same effect.

Avoid bleaches with additives. Thickeners, scents, or “splash-less” chemicals can make your pool foamy or cloudy. Buy the cheapest, plainest unscented bleach you can find.

Calculate the correct dose for your pool size. Use a pool calculator to figure out how much bleach to add. Pour it slowly around the edges while the pump runs.

This is an emergency hack, not a routine solution. Bleach degrades quickly in sunlight and heat. For regular shocking, pool shock is cheaper per gallon of active chlorine and won’t surprise you with foam.

Pool shock dissolves faster and stays potent. It’s formulated for pools, so it works more reliably. Don’t make bleach your go-to.