My aqua safe (~2 1/2 years old) has been great. I added a generic DI chamber to it and get consistent low TDS. I haven't changed the resin/cartridges once and I'm still getting <5 TDS from the unit. I will be ordering some new cartridges from OA though. I was also looking at aquafx's units, as they have one that has a 1/1 waste water ratio (the octopus)!
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