The Pond Digger Rock and Waterfall ScrubberThe Pond Digger Pond Debris Scrubber is a NATURAL OXYGEN BASED product that works as your strongest line of defense to quickly and safely remove debris from rocks, waterfalls, streams and anywhere else build up has occurred. These fish safe dissolvable granules bring the natural cleansing power of oxygen to the pond world! Our product also restores a natural electrolyte balance to the pond with a slight buffering effect to help prevent dangerous PH