Super Stain Treat®  (2.5 lbs) by United Chemicals- Treats 20,000 gallons Product number SST-C12 The hottest product for eliminating all kinds of metallic stains Super Stain Treat® replaces draining and acid washing. It is effective across the whole pH range. Super Stain Treat® is compatible with all surfaces including, marcite, fiberglass, gunite, vinyl and exposed aggregate. It is the first step in a two-step program for removing and prevention. • Effectively removes stains from fiberglass. • Granular concentrate is more powerful & concentrated than typical liquid stain removers. • Delivers enhanced performance when it's needed most - unlike most liquid treatments (which break down when pH drops). • Dollar for dollar, the most powerful stain remover ever made.