It’s critically important to never mix chlorine with muriatic acid or dry acid inside or outside your pool. This mixture can create a dangerous toxic gas that’s harmful if inhaled.

If you need to adjust the pH level of your pool and add acid, be sure to do so separately and wait several hours before adding chlorine.

Also, never shock your pool immediately after adding acid to it.

Always follow the manufacturer’s instructions for dosing and adding chemicals to your pool, and wear protective gear such as gloves and goggles.