Acid washing removes plaster and therefore shortens the life of the pool surface. No Dran Acid Wash kits minimizes this and other problems. Anyone can perform this process with no prior pool experience. Just follow the easy instructions and brush the pool with the pool brush. No Dran's powerful chemistry will do the rest. The stains soak right off the pool surface. Best of all, you don't even have to drain the pool! No Dran Acid Wash kit works on any pool surface, including fiberglass, painted, vinyl and marcite.