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This is a spherical, macroreticular ion-exchange resin sold in five 50g mesh bags for aquarium filtration. It targets dissolved organics and nutrient buildup, and its color shift from light yellow to dark brown or black signals when it is saturated. Soaking it in strong salt water for about 12 hours restores it, so one purchase lasts through repeated cycles. It suits freshwater and saltwater keepers with canister, sump, hang-on or drip-tray filtration who want reusable chemical media rather than disposable cartridges.
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Lowest price we've seen: $12.99 on Nov 12 at Amazon. Tracked across 1 store since Nov 12.
This organic filtration resin is a filter media for aquariums. It helps keep fish, coral and plants from producing unpleasant substances, balances nutrients in the water and extends the time between water changes.
The resin beads are spherical and macroreticular. Their microscopic pores give them a contact surface area many times larger than most spherical resin.
Rinse the resin in water for 1 minute before first use. Then place the filled mesh bag in the filter tank or another suitable location. As the resin takes up waste, its color changes from light yellow to dark brown or even black. When it is saturated, remove it and soak it in high-concentration salt water for about 12 hours, then reuse it. Clean it about once a month.
