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It's pretty easy. You use a solution of caustic soda ( lye, sodium hydroxide) to separate the resins into the cation and anion. Then you have to soak the cation in an acid solution.Sorry, dumb question, how do you recharge the resin? We’ve got the BRS 5stage with the resin tube. Isn’t it shot after color change? I’m not sure of all this, husband hooks it all up!
Thanks, Debra
Lots of instructions on the web. This is the first one that I used way back https://reefkeeping.com/issues/2008-09/nftt/index.php