Sludge Remover Bacteria blocks are designed to remove organic sludge from the bottom of lakes and ponds. Sludge is the result of fish waste, dead algae or plant material, uneaten fish food, leaves and other debris. When introduced to the water, the blocks sink, dissolve and begin to remove bottom organic sludge — often several inches per year.
1-Ounce BLOCKS: Apply 1 one ounce block per 200-250 square feet of beach, shoreline or problem area every two weeks.
1-Ounce BLOCKS:Apply 15-20 blocks per 1/4 acre of pond surface area every two weeks.
Avoid using copper based algaecides for 48 hours within application.