BioGuard Super Soluble is a quick-dissolving chlorine concentrate. Eliminate bacteria without upsetting the balance of the pool water. This product leaves no residue to cloud the water and is safe for use in all types of pools. It has 56% available chlorine and is comprised of 97% active ingredients. Product formula won’t lower pH. Super Soluble is an ideal choice for sanitizing small, above-ground pools, and in-ground vinyl-lined pools.