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I have thought about setting up an experimental tank that I pump old saltwater from a water change into and perform a regenerating or purification process on it. I was thinking of passing the water through a denitrator, a tank full of live rock and a carbon and phosphate reactor for the very obvious removal of nitrates and organics. The calcium ,mag and alk levels should be fine since it was removed from my system where those parameters are fairly stable. My biggest concern is the reintroduction of trace elements. Quite honestly I know nothing to very little about them and was looking for input from you guys about the importance of these and a possible additive to replenish with. Oh yea any other thoughts you may have on the concept as a whole. Think tank here is what I'm after. After this treatment of course reintroduction into the system.