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Pond Sludge Remover Packs eliminate pond sludge on rocks, gravel and filtration. Sludge buildup is caused by fish waste, plant matter and other decaying material. The easy-to-use water soluble packs dose the sludge directly and make it easy to spot-treat and treat hard to reach areas. Each pack treats up to 1,000 gallons of water. Pond Sludge Remover Packs are safe for fish, plants, and animals.
