Jeff, considering water quality in you reef begins with the purity of the water used to mix with your salt, I don't think a 5 stage RO/Di is overkill if you can afford it( make do with less) Things to consider are the amount of dissolved solids(minerals) and organic pollutants(nitrates,phophates, chemical contamination,etc) If you live in a large metropoplitan area with heavily trated tap water or a rural area with lots of agriculture I'd recommend the best water filtration setup you can afford. It really makes no sense to have thousands invested in a reef and risk it to save a hundred bucks
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I thought I was me, but we were wrong
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