API Turtle Sludge Destroyer is packed with live beneficial bacteria that quickly and effectively break down organic waste and debris. Use it regularly to enjoy cleaner, clearer water and to reduce the amount of required maintenance. Fast-acting solution also eliminates unsavory odors. For best results, use API Turtle Sludge Destroyer weekly to reduce the presence of organic sludge, and when water is changed. 8 fl oz size treats 474 gallons. Convenient dosing cap included!