TDS Water Quality Tester

[bstreep]

Originally Posted by GordMay

True, but if the R/O membrane is rejecting salt, it's likely rejecting most bacteria & virus pathogens, which are (almost) all larger than a dissolved salt molecule. Hence a TDS meter is useful for testing R/O output quality.

Not just almost, Gord. All. Salt molecules are miniscule compared to even the smallest virus.

I agreed with you, above. I'd keep a TDS meter for monitoring R/O output - they make inline meters that are cheap ($30).