The Filstar Phos Zorb has a special filtration material that selectively removes phosphate and silicate, common nutrients found in fresh- and saltwater aquariums. Silicate is added to tap water to reduce pipe corrosion while phosphate is a byproduct of fish metabolism. These chemicals, if left to accumulate, will lead to reduced water quality. To use, remove filter pouch from plastic bag, leaving the filter pouch unopened. Rinse in water to several minutes to activate and then place pouch directly into the filtration basket. Be sure to replace the filter every one to three months, depending on stocking density and water quality.
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