Check the listing for details. Pond Boss The Block 5 lb. Bio-Maintenance Block Bacteria. Condition: New. Listed at 67.99 USD. Pond Boss The Block 5 lb. Bio-Maintenance (MPN CBBPR5) The Block by pond boss PRO is a blend of live bacteria and enzymes specifically designed to improve water quality by reducing unwanted nutrients. Decaying nutrients such as leaves, grass clipping, dead plants, excess food and other organic material build at the bottom of the pond in what is commonly called the sludge layer of the pond. The sludge layer is most often responsible for undesirable odors and low oxygen levels. Regular use of pond boss PRO The Block will degrade unwanted organic debris accumulation and improve the overall health of the pond while clearing the water column of unwanted organic material. This time released 5 lb. block can treat up to 5 acre-feet (1.6 million gallons)* of water over the course of 60 days. Increases water clarity Significantly reduces noxious odors caused by hydrogen sulfide, dead plants, and fish waste Reduces ammonia and nitrogen levels Dissolves away organic sludge Improves dissolved oxygen levels Effective over a wide range of pH conditions and water temperatures Releases bacteria throughout use One 5 lb. block treats 5 acre-feet of water (1.6 million gallons) Webb's eBay Store Store Home Store Policies Feedback Shipping Most orders are shipped from our warehouse in Maryland. We warehouse over 95% of the items that we offer, which is a key to our quick order turn-around. Some orders are drop shipped directly from our manufacturer's in various states within the continental US. All orders are shipped via either UPS or FedEx therefore we cannot deliver to PO boxes, please supply a physical address to which we can ship your order. Payment We accept PayPal and the following credit cards: Visa, MasterCard, American Express, and Discover. Please feel free to call with any questions.