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.
Keeps pond water clean and clear
Bio-active cleaning block for pond maintenance
Breaks down wastes which accumulate on the bottom of ponds
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 ponds natural biological balance.

Dosage: 4 blocks treat up to 1,000 gallons.