FRITZ ZYME 9 contains pure, live, active cultures of non-pathogenic, non-toxic Nitrosococcus and Nitrococcus nitrifying bacteria. Proven to be the best saltwater bitrifying bacteria product available in an independent laboratory test performed at The University of California, FRITZZYME #9 begins rapidly reducing ammonia and nitrite when added to any system. Always add FRITZ-ZYME #9: - To new tanks - After rigorous cleaning - After changing bio-media - When adding new livestock - Whenever ammonia or nitrite imbalances occur. Quick and Easy Reference: - Nitrifying Bacteria count (minimum) 2, 500,000 per ounce - Professional formula for use in all marinesystems; safe for use in reef tanks and with sharks, rays - Removes ammonia and nitrites the safe, permanent and natural way - Does not require refrigeration - Add 1 cup (8 oz) per 10 gallons to jump-start new systems or reduce ammonia/nitrite spike