Rx Clear Swimming Pool Algaecide 60 Plus | One Quart Bottles | 4 Pack | Above or Inground Pools | Keeping Algae in Suspension HEAT ACTIVATED- The Rx Clear Swimming Pool Algaecide works best in warm waters. The product will not stain surfaces and leaves zero residue. COAT THE WALL- Algaecide coats the walls of the swimming pool, keeping algae in suspension. Surfactant splits open algae cells, helping to destroy them.The Rx Clear algaecide coats the pool wall, keeping your swimming pool crystal clear. SAFE TO SWIM- This fast acting treatment lets you swim directly after placing in your swimming pool.algaecide can even beat black, green and mustard algae, all while being safe for swimmers. BIWEEKLY MAINTENANCE- Each bottle of Algaecide is 32 ounces of fluid. Swimming pools require only 4 oz. of Rx Clear Swimming Pool Algaecide every two weeks per every 10,000 gallons of water. NO FOAM- Whether you have an in-ground or above ground pool this product will work to keep algae at bay without making your swimming pool filled with foam. To avoid foaming, do not exceed beyond the recommended dosages and apply gently in one spot away from return.