Rendezvous Spa Specialties Spa Clarifier clears cloudy water and adds sparkle by removing microparticles that dull spa water. This product improves filter efficiency and does not adversely affect pH. It makes your spa much more inviting than if it were cloudy. Spa Clarifier is compatible with chlorine, bromine, biguanide, ozone, and mineral purification systems. This product is concentrated and highly effective.