Filter Media » Seachem » Seachem Purigen™

PhosGuard™ rapidly removes phosphate and silicate from marine and freshwater aquaria. It is not recommended for phosphate buffered freshwater. PhosGuard™ is highly porous for high capacity and beadshaped 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.