i-clean Spa-Force Active Biological Cleaner/Oils Digester/Deoderizer (100gram) SHOCK - FOR TOUGH WATER - Removes oils, greases and odors through active digestion Continuously works on cleaning oils, greases and odors from both the water and the filter(s) for up to 7 days Works best with continued use and will reduce the need for clarifiers and chemicals Activates in warm water, just add to spa water that is between 94 and 104 degree F Made in the USA and uses only recyclable containers and scoops