CrystalClear® ClarityMaxTM multi-purpose cleaning action cleans ponds with an unprecedented combination of activated barley, natural bacteria, enzymes and a powerful secret ingredient. These ingredients work in tandem to clean, polish and break down dead organic debris on and around waterfalls, streams, plant pots and filtration systems. CrystalClear® ClarityMaxTM also maintains crystal clear water for the long term. Use when water temperatures are above 50°F.