PondCare Ammo Rocks 10 lb
The perfect biological filter substrate made from 100% Zeolite. Natural ion-exchange resins trap the toxic ammonia on the surface of the Ammo-Rocks. The growth of nitrifying bacteria is stimulated by the high surface area concentration of ammonia. The nitrifying bacteria grow faster and produce larger and more active colonies in the filter.
Ammo-Rocks can be used with all pond fish including goldfish and koi. Ammo-Rocks will not change pH.