Nutrafin Waste Control Biological Aquarium Cleaner. Nutrafin Waste Control - Biological Aquarium Cleaner helps decrease aquarium maintenance by reducing waste in gravel, power filters, decorative features and on interior aquarium surfaces. Waste Control’s unique biological process rapidly digests organic waste resulting from overfeeding, fish waste and other decaying material such as plant leaves. Nutrafin Waste Control is especially beneficial for goldfish, cichlids, and heavily-populated aquariums where large amounts of fish waste are expected. During the course of rapid organic waste breakdown, ammonia levels may rise. The simultaneous use of Nutrafin Cycle Biological Aquarium Supplement is strongly recommended to control and prevent potential increased ammonia and nitrite levels, as well as to support optimal water quality and clean aquarium conditions. Rapidly reduces organic waste Helps reduce aquarium maintenance Synergistic effect with cycle For fresh and saltwater use Available Sizes: 120 mL (4 fl oz) / 250 mL (8.4 fl oz) / 500 mL (16.9 fl oz)