Ecological Labs SEL21046 Microbe-Lift Turtle Rock and Substrate Cleaner, 4-Ounce Rock And Substrate Cleaner Speeds The Biological Breakdown Of Slow To Degrade Organic Waste Matter From Tank Bottoms That Become Toxic To Turtles Provides Rapid Natural Sludge Reduction And 80 Percent Faster Than Bacterial Products Alone Features biologically degrades bottom organic sludge and muck, reducing or eliminating the potential harmful gaseous compounds Cleans Turtle Shells And Limbs, Helps To Prevent Shell Rot, Clarify Tank Water At The Same Time, Degrade Fecal Matter And Improves Filtration This Product Weighs 4-Ounce