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I have a RO Buddy system.
In this small system (50gpd) I can easily monitor resin color (an determine time for change) and have the carbon tubes marked, by sharpie, with installation dates.
I change out resin as needed, the carbon and RO cartridge every 6 months (about $30), and the membrane...
Mark at Ultimate Corals in Jackson has a bogo sale on at the moment. Great guy to look to for advice and the sale is something i'd take advantage of if I didnt have 18,000 zoas in my tank atm.
Nice job. Think i'm going to be hitting Mark up next week for a few shrooms and palys myself.
Love the idea of an overflow for the top up, my son has a beta tank with same principle and works well. Alo like the duality as in emergency or for complete WC you have the low tap for a full empty...