Phosphate is a byproduct of fish metabolism. silicate is often added to municipal water supplies to reduce pipe erosion. if left to accumulate these will result in reduced water quality.

Product Details
Remove pouch from package. do not open pouch. rinse with water to remove any dust. place directly into filter. replace every one to three months.
Selevtively removes phosphate and silicate two common chemicals found in both freshwater and saltwater aquariums. one 150 gram pouch treats 55 u.s. gallons of water.

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