The SpaPure Clarifier is a liquid formula that is designed to increase filter efficiency. This product combines together microscopic particles to create larger ones. These larger particles are then easier to remove from the water through the filter. It can be used in your weekly routine to maintain the water at its best or you can use it clarify your spa when it gets dull or cloudy. This product is compatible with chlorine, bromine, and biguanide sanitizing systems.