Quote:
Originally Posted by Myka
In cases like this, it's wise to put a second RO cartridge. Test the water coming out of the second RO cartridge on a regular basis, and when it gets up to 15-20 ppm, throw away the first RO in line, put the second RO into the first spot, and put a fresh one into the second spot. Be sure to change out the sediment and carbon filters every 6 months (no matter how much you use it). Change out the DI resin as soon as you get 1 ppm tds. You should be able to achieve 0 ppm tds this way, and if you swap the two ROs like I suggested you actually won't burn through many more RO cartridges than if you were only running one. 
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You mean run them in series? Do I would have the clean water from one membrane go into the other? 2 RO waste drains? Or parralel them?