Dual-action pond filter media made of natural zeolite ion-exchange resinActively removes ammonia and stimulates beneficial bacteria growthUse in pond skimmers or any type of pond filter to enhance biological filtrationDual-action pond filter media removes toxic ammonia and establishes efficient biological filtration. Natural zeolite ion-exchange resin actively traps ammonia onto its surface and stimulates the growth of large bacterial colonies. Beneficial nitrifying bacteria grow faster and produce larger and more active colonies in the filter. Place in skimmer or pond filter to help new ponds mature faster and safer without harmful ammonia spikes. Also great for established ponds. Ammo-Rocks are safe and can be used with all pond fish including goldfish and koi. Ammo-Rocks will not change pH. 10 lbs treats up to 300 gallons. Media is approximately 1/2" to 3/4" in size.Please click on "More Information" for directions and Frequently Asked Questions.

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