Bestway Clearwater 1 Litre Clarifier is the utmost tool for keeping the water in your pool or spa looking spotless and crystal clear.Pool or spa water can begin to look murky as algae, dirt and grime that's too small to be trapped in the filter begins to build up in the main body of water. Over time, tiny particles of dirt can make pool water look cloudy and uninviting and will eventually make your pool or spa unhygienic and unpleasant to be in.This swimming pool clarifier contains flocculants which bind the small particles together so that a pool's filter will be able to catch them. If you have used Clearwater's Algaecide then you will need to use the Clearwater Clarifier to clear away the residue.As with all chemical products, instructions and warnings should be followed and heeded very carefully.