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Optimise your pool experience. Use Pool Sentinel to remove BIO-FILM from your pool. Eliminates bio-film from pool, pipes and filtration Provides crystal clear, safe bathing water Is gentle to the most sensitive of skin Makes water extra soft Reduces the harsh effect of chemicals Reduces chemical use by up to 70% Eliminates slimy walls and calcium deposits Works with all pool finishes and filter types Note: this product can not be shipped, and is available in-store only.