Pond Zinger works like a magnet, binding together the excess phosphorous in a pond, thereby reducing the algae’s food source. Pond Zinger can be installed on the steps of a waterfall, beneath a floating fountain, over an aerator in any pond, or with any other mixing or circulation mechanism and, unlike algaecide, no monitoring or testing is required. Safely treats ponds between 500 and 12,000 gallons. Safe for fish. Applied Polymer Systems.