Purigen is a quality synthetic adsorbent that is distinct to any other filtration product. It is not a combination of ion exchangers or adsorbents, but a unique macro-porous synthetic polymer that removes soluble and insoluble impurities from water at a pace and aptitude that exceeds all others by over 500%. Ammonia, nitrites and nitrates are controlled by removing nitrogenous organic waste that would otherwise discharge these harmful compounds. It has a minimal effect on trace elements. Purigen considerably raises redox and polishes water to unparalleled clarity. Purigen darkens progressively as it exhausts, and is easily renewed by treating with bleach. Purigen is suitable for both marine and freshwater use. Directions Rinse before use. Use in a fine mesh filter bag. Each 1 L treats up to 4,000 L (1,000 gallons*) for up to six months. Exhaustion is indicated by a pronounced discoloration of the beads to dark brown or black. Regeneration: Soak in a 1:1 bleach: water solution for 24 hours in a non-metallic container in a well ventilated area and away from children. Rinse well, and then soak for 8 hours with a solution containing 2 tablespoons of ChlorGuard, Prime, or equivalent dechlorinator per cup of water. Rinse well. Original colour and full activity should now be restored and Purigen is ready for reuse. Caution: some slime coat products may permanently foul Purigen and render regeneration difficult. Do not reuse if odour of chlorine is detectable. In case of doubt, soak beads in small quantity of water and test for residual chlorine with a chlorine test kit.