API Pond, 8 OZ, Zyme Sludge Destroyer, Pond Water Cleaner With Barley, Contains Natural Active Ingredients To Break Down Fish Waste & Consume Pond Sludge, Breaks Down Dead Algae & Digests Leaves & Grass Clippings, Helps To Reduce Overall Pond Maintenance & Keep Pond Clean, Use Twice A Week For 2 Weeks In Ornamental Ponds For Start Up & End Of Season, Then Once Every 2 Weeks For Regular Maintenance.