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Aquarium Pharmaceuticals Stress Zyme 8 OZ

Contains 300 million live bacteria per teaspoonful. Helps clean an aquarium by eliminating sludge build-up. Prevents ammonia & nitrite poisoning, low oxygen levels & low pH. Use when setting up and maintaining an aquarium.
Use Instructions: Shake Well. To maintain a clean, healthy aquarium: add 1 tsp. (5 ml) per 10 U.S. gallons (38 L) or 1/2 cup (120 ml) for each 240 U.S. gallons (912 L) of water weekly. For new aquariums, to help boost the biological filter: double the dose, use at start up, and for 2 additional weeks.