4 Things to Know About Using Vitamin C for Metal Pool Stains

Identify the metal first Vitamin C only works on iron stains, which appear brown or rust-colored. Copper stains (green or blue) need a sequestering agent from the pool store.

Rub the stain with crushed vitamin C in a sock Pour crushed tablets into a sock and rub the stain directly. If it fades immediately, it is iron. If nothing happens, it is copper or manganese.

Do not raise chlorine before treating Chlorine sets metal stains permanently. Treat stains before shocking the pool.

Be gentle on the pool surface Scrubbing too hard damages plaster. Liners are more forgiving, but avoid excessive force.