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I do have an RO system but I was curious. For what ever reason I go through more resin than I should but even so my cost per gallon of finished saltwater is under $.30 and I go through about 50 gallons per month, my cost for plain RO is under a dime. I suppose if a person has a nano it may not be worth the upfront cost of an RO system.
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John
100 gallon DT and 50 gallon sump with refugium. Reefbreeders Photon V2+.
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