Synthetic Polymer Resin – Macropore Filter Media
synthetic absorbent polymer that removes impurities from water and polishes it to a crystal clear clarity. It is active on Quartinary Ammonia groups like nitrates. It can be recharged with salt for freshwater use until it darkens to a point where Chlorine must be used to re-whiten, every three or four recharges.
1 litre of Macro-pore will treat 5000 litres. This is a fabulous product that works, place Macropore in Resin Bag so contents can’t escape into your aquarium.