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Tetra Pond Pond Sludge Reducer with Clear-Zyme Technology blocks are bio-active cleaning blocks that will keep water clean and clear by breaking down wastes which accumulate on the bottom of ponds as a sludge layer.
Also great to use during the setup of a new pond and the spring start-up or fall shut-down of established ponds.
The blend of safe enzyme producing bacteria helps develop and maintain the pond's natural biological balance.
4 blocks treat up to 1,000 gallons.