Waste-Away gels are full of our Waste-Away nitrate, phosphate and sludge reducing bacteria that are automatically and continuously released into your tank to consume nutrients and break down fish waste keeping your tank clean and water clear. Helps maintain a clean tank. REEF SAFE. Down fish waste. Lasts up to 30 days. Gets into the nooks and crannies of hard to reach areas. Just peel and stick in the sump, filter box, tank or anywhere in your system.