Microbe-Lift Calc. Montmorillonite Clay 4 lbs. Clay is used in ponds to achieve many goals: improving fish color, detoxifying and clarifying pond water, fish nutrition through mineral ingestion and for immunity against diseases.Montmorillonite Clay DosagePond Size (gallons)Maintenance100 – 2491 level teaspoon twice weekly250 – 5001 level tablespoon twice weekly501 – 1,0002 level tablespoons twice weekly SKU: MLKKB4 Categories: Beneficial Bacteria, Sludge and Muck Reducers/Clarifiers, Water Conditioners & Dechlorinators, Water Treatment Tags: 4 lbs., clarifier, clay, microbe-lift