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Coming up 6 years with a simple mechanical furnace humidifier float valve in the sump connected directly to my ro/di (with 3g holding tank tee'd in the line). Zero problems, can't say I notice TDS creep directly but after 6 months or more it will start to rise but then about what I would expect the resin's life would be anyways.
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Current Tank Info: 145g Starfire display (mixed reef) w/75g basement sump & 20g refugium, Barracuda return, Dart w/OM 4way CL, AI Hydras and Director.
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