This product is a slightly modified version of the Pond-Vive above. While the Pond-Vive is designed to target several problem areas of water quality, these sludge remover pellets are specifically designed to reduce sludge.This product is a slightly modified version of the Pond-Vive above. While the Pond-Vive is designed to target several problem areas of water quality, these sludge remover pellets are specifically designed to reduce sludge. Great for spot treating around docks, beaches or partially treating large ponds Pellets are heavy and sink down into muck directly where they are applied. Best used in conjunction with Pond-Vive (above) for a complete water quality program. Additional Information Initial Dose :1 pellet every 200 to 250 sq ft Maintenance Dose : 1 pellet every 200 to 250 sq ft every 2 weeks