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Ultra Clear SST is a Super Strength biological treatment for clarifying ponds from top to bottom. It is more than twice the strength of the regular Ultra Clear and contains a special additional blend of natural bacteria. Digests organic sediment, eliminates odor, and is safe for fish and wildlife. Especially effective for control of many types of algae and string algae. Also exceptionally good for use to restore the ecology of the pool water after using a fast acting algacide such as GreenClean on severe string algae problems. Use 1 ounce for every 150 gallons of pond volume. (Example, Pond volume = 600 gallons, then 600/150 = 4 ounces).