Seachem PhosGuard Aquarium Water Conditioner

Removes silicate and phosphate; spherical beads for optimal hydrodynamics; irreversible binding.

May generate heat on initial contact with water. Pre-wet by adding to a double volume of freshwater, followed by a rinse. For best results, rinse before use and place so as to maximize the flow of water through it without allowing it to tumble against itself. It may be used in a canister filter, media chamber, box filter, or any high-flow area of a trickle filter. Use of a filter bag is recommended. Use 85 mL (1/3 cup) for every 200 L (50 US gallons) saltwater or 400 L (100 US gallons) freshwater. Leave product in place for 4 days, then test phosphate or silicate concentrations. Replace PhosGuard only when concentrations begin to climb again. Over-treating is not recommended.