It may generate heat upon initial contact with water. Pre-soak with double the volume of fresh water, then rinse. For best results, PhosGuard should be rinsed before use and placed in a way that maximizes water flow through it but not so that it falls against itself in flow.

It can be used in:

• Canister filter
• Media chamber
• Box filter
• Any high-flow area of a filter

Using a filter bag is recommended. Use 85 mL (1/3 cup) for every 200 L (50 US gallons) of saltwater or 400 L (100 US gallons) of freshwater. Leave the product in place for 4 days and then test phosphate or silicate concentrations with MultiTest Phosphate or MultiTest Silicate. If the concentration of the component you are trying to reduce has not decreased to about 0.02 mg / L, then replace the PhosGuard; otherwise, leave it in place until levels start rising again. As long as concentrations remain under control, the product does not deplete.