Seachem Purigen 250ml Ultimate Filtration

Rinse before use. Use in a fine mesh (180 micron or less) filter bag such as Seachem’s The Bag. For best results, Purigen should be placed so as to maximize the flow of water through it. It may be used in a canister filter, media chamber, box filter, or any high flow area of a trickle filter. Each 250 mL treats up to 1,000 L (250 US gallons) for up to six months. Exhaustion is indicated by a pronounced discoloration of the beads to dark brown or black.