Formulated by DrTim's Aquatics - the most trusted name in Fish Care for Aquariums, Ponds and Aquaculture. Contains Unique Live Nitrifying Bacteria. Seeds and Enhances the Biological Filter. New Technology makes our Live Nitrifying Bacteria Free of Odors. Clear and Natural - No Artificial Dyes added. Eliminates Ammonia and Nitrite, Naturally. Keeps Water Clean. Helps to Maintain Healthy fish. For Fresh Water Only. Promotes Natural Cycling. Safe for all fish and plants including household pets that may drink the water. Concentrated Formula Treats 2 times more water. DO NOT FREEZE. MADE IN THE USA.