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Harris Septic MAX treatment features a 2X super concentrated septic system treatment that is safe for users and the environment. It dissolves toilet paper, oil and grease with a natural enzyme-producing bacteria. The enzymes also help to prevent septic backups when used regularly. To use, simply drop 1 pouch in the toilet, let it dissolve and flush. Repeat this process every 2 months for 500-1500 gallon tanks. Ingredients include: Wheat Bran, Salt, Sodium Bicarbonate, Citric Acid, Stabilized Enzymes and Live Bacterial Cultures. Contains no phosphates.