Review on Seachem 116020305 Cuprisorb 500Ml by Jenna Willis

Works very well for removing copper from the SW tank. But there's no mystery about what it is and how it works. It is simply a silicate based deionizing resin used in every reverse osmosis system. I took off 2 stars because you can literally buy a non-Seachem resin that does the same without the fancy packaging or high retail markup. If you have a reverse osmosis system everywhere to buy replacement filters, chances are there is tar in there. Revain also sells deionizing resins. I saw it for £3 for $33 with free shipping.