Easy-to-use phosphate-removing chemical filter mediaSelectively filters out the algal nutrients, phosphate and silicateImproves aquarium water quality by removing phosphateA special filtration material that selectively removes phosphate and silicate, common nutrients found in fresh and saltwater aquariums. In saltwater aquariums, excess phosphate lowers the available calcium and magnesium necessary for the growth of hard corals and other invertebrates. Use one pouch for every 55 gallons of aquarium water. 150 grams.Please click on "More Information" for directions for use.

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