Check the listing for details. The Pond Digger Rock & Waterfall Scrubber - Oxygen Cleaner. Condition: New. Listed at 29.99 USD. The Pond Digger Rock & Waterfall Scrubber is a natural, oxygen-based product that quickly and safely removes debris from rocks, waterfalls, streams and anywhere else build-up has occurred. If used regularly, you could help eliminate the need for annual pond cleanouts. These fish-safe dissolvable granules bring the natural cleansing power of oxygen to the pond world! Also restores a natural electrolyte balance to the pond with a slight buffering effect to help prevent dangerous pH swings. Contains no harmful detergents or other chemicals.Fast acting oxygen scrubbing action breaks down debris and build-upHelps reduce need for annual clean-outsSafe for fish & aquatic plants For Optimal Results Use with Pond Digger Beneficial Bacteria, which will consume the organic debris once it is loosened from the pond’s edges, rocks and stones. Ensure that the pond is equipped with a mechanical skimmer device or remove excess debris with a fine net the day after treatment. For best results in streams and waterfalls, shut off pump during application and turn pump on again directly after application. Retreat after 48 hours as needed. 1761, 1762, 1763, 1764, TPDRX8, TPDRX16, TPDRX32, TPDRX25