Fritz-Zyme #7 Freshwater.

Item 391, 8 oz, treats 20 gallons
Item 66, 16 oz, treats 40 gallons
Item 692, 32 oz, treats 80 gallons

Bacteria in a bottle. 8 oz forms a viable culture for your 20 gallon tank. Shelf life is short: buy only what you will use in the next 3 months, but it is valuable to have on hand. Fritz-Zyme naturally processes ammonia and nitrites with real nitrosomonas and nitrobacter bacteria that multiply in your tank. Other products recommend that you add them once a week, so the enzymes that DON'T multiply can process the ammonia and nitrites, and starve your bio-filter. Use on new tanks, cycling tanks, and when medication damages your biological filter. 6 month maximum shelf life. Large sizes, saltwater, available. Compare to $9.00 for 16 oz of products containing enzymes and millions of heterotrophic bacteria, that do not form a healthy, lasting, biological filter. There is NO comparable product. (and major university studies agree.)
Contains nitrosomonas and nitrobacter bacteria.

Saltwater Fritz-Zyme 9 is on the marine page.

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