I think its to general of a statement because we all have different parameters in our tap water and it does vary from time to time. I think consistency is the key that's why ro is preferred. my tds is 65 out of the tap
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150 gallon reef mostly softies/lps. 50 gal sump with bubble magnus skimmer/ Led fuge light/refugium/ 1200 return and tunze powerheads. Dual pharoah main tank led.4 pump dosser.
550 gallon stingray tank water drip system
150 bowfront. 75 turtle tank, many others
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