Kasco Marine Macro-Zyme Muck Pucks Product Details Product Dimensions: 8.7 x 7.9 x 7.9 inches Item Weight: 8.2 pounds Shipping Weight: 8.2 pounds Manufacturer: Kasco Marine Sludge Remover Odor Eliminator High amounts of CFUs Comes with approx. 266 pucks Each tablet will treat up to 10' x 2' area! Macro-ZymeTM Muck Pucks are ideal spot treatments around docks and swimmingareas to address muck accumulation and water quality issues. The easy-to-usetablets are perfect for the homeowner to use in problem areas. The completelysafe, non-toxic formula of beneficial bacteria will aggressively decompose thebuild-up of organic matter in a way that is not harmful to fish, wildlife,pets, or people. The pucks are approximately the diameter of a quarter and areabout 1/2″ tall. Each tablet will treat up to 10 ft.2 of bottom area and eachhas as much, if not more, CFU's as other bacteria products on the market. Thepulverized barley binder adds micro-nutrients to kick start the bacteria anddecomposition processes. Magnesium is also added as a bacteria stimulator.Muck Pucks are available in a user-friendly, pull top pail. Each pail weighs 7lbs. and contains approximately 266 pucks. Reapplication is suggested every2-3 weeks when water temps are above 55 F.