The ONLY solution to this situation is shock treating the pool. IDEAL offers four kinds of pool water shock treatment products. The contents of these products are completely different, but all provide excellent shock treating capabilities.
Fast Shock (Lithium Hypochlorite) dissolves fast to oxidize contaminants without raising the free chlorine to unsafe levels. It is safe to use in vinyl liner pools because it dissolves so quickly.
Non-Chlorine Oxidizing Shock (Potassium Monopersulfate) is a powerful oxidizer which destroys organic matter in the water and prevents the formation of combined chlorine. Since it contains no chlorine, swimming may resume immediately after use.
Multi-Shock (Dichlor-Potassium Monopersulfate Blend) is a combo shock that provides the benefits of both granular chlorine ( dichlor ) and non-chlorine shock. It helps control algae and bbacteria growth and prevents the formation of combined chlorine.