5 Steps to Remove Stains from Pool Plaster Without Damaging It

Start with a stain ID kit A simple test kit tells you whether the stain is metal (iron, copper, manganese) or organic (leaves, algae, pollen). Guessing wrong wastes time and can etch the plaster.

Use ascorbic acid for metal stains Turn off the pump, broadcast powdered ascorbic acid directly over the stain, wait 15 minutes, then brush. If the stain fades, you’ve solved it.

Treat organic stains with shock or enzymes Organics respond to a good shock treatment or a stain-specific enzyme. Do not use acid on organic stains.

Never use copper-based algaecide if you have copper stains It adds more copper and makes the problem worse. Test your source water for metals before refilling.

Avoid muriatic acid as a first resort Pouring in muriatic acid without knowing the stain type etches the plaster and worsens the issue. Patience and the right chemical prevent early replastering.