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Fluval Peat Granules and a natural way to soften your aquarium water and adjusts the pH for neutral to lower acid levels that most freshwater fish and plants love. This should be used in conjunction with Fluval Fine Pads to optimize the purity of aquarium water. For freshwater and marine environments. Fluval FX5 Water Polishing Filter filter pad replacements should be changed approximately every 2-3 months, though they can be rinsed clean between filter changes to extend filter life.