Spa Super Blue water polish is highly concentrated and formulated for use in hot water. Produces and maintains crystal clear water under all conditions without effecting pH balance or other chemicals. Spa Super Blue improves filter efficiency and is nontoxic, non-irritating and biodegradable. Spa Super Blue is the most respected and successful name in spa water clarifiers. It aids in the removal of dirt, organic debris, oils, soap, color and all suspended particles that give spa water a dull or cloudy appearance. When used regularly, Super Blue for Spas improves filter efficiency and reduces the organic contents of spa water so that the sanitizer can be more efficient and effective.