PhosGuardª rapidly removes phosphate and silicate from marine and freshwater aquaria. It is not recommended for phosphate buffered freshwater. PhosGuardª is highly porous for high capacity and bead-shaped for optimum water flow. It outperforms all competing products. 500 mL easily treats over 150 gallons*. This product is sold by volume. Cited weight is minimal weight.
DIRECTIONS: Use one bag for each 120 L (30 US gallons). For best results, PhosGuardª should be placed so as to maximize the flow of water through it. It may be used in a canister filter, box filter, or any high flow area of a trickle filter. Leave product in place for 4 days, then test phosphate or silicate concentrations with either MultiTest: Phosphateª or MultiTest: Silicateª. If the concentration of the component you are trying to decrease has not dropped to around 0.02 mg/L, then replace the PhosGuardª, otherwise leave in place until levels begin to climb again. As long as concentrations remain under control, the product is not exhausted. PhosGuardª does not leach phosphate or silicate back into the water and may be removed, dried, and returned to service until exhausted. Each 100 mL of PhosGuardª will remove up to 20 mg/L phosphate in 120 L (30 US gallons) of water, depending on the initial phosphate/silicate concentrations and the current biological load. Over treating is not recommended. PhosGuardª is not an exchange resin, it does not release anything into the water. Continuous use of small quantities is better than intermittent use of larger quantities. Caution! May generate heat on initial contact with water. Pre-wet by adding to a double volume of freshwater (e.g. 250 mL of product in 500 mL water), followed by a rinse.