Regal 29-60084-90 900mL Super Clear Plus enhances the effectiveness of the filtering system by collecting microscopic particles into larger masses. The masses formed are then captured by the filtration system. SUPER CLEAR PLUS is not affected by chlorine or bromine. SUPER CLEAR PLUS does not contain alum and works at most pH levels. The spa can be used immediately after the addition of SUPER CLEAR PLUS. It’s natural and biodegradable formula also makes it safe for the environment and will not add phosphates to the water.