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Old 01/16/2008, 06:24 PM   #104
AZDesertRat
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Join Date: Jan 2002
Location: NW Phoenix
Posts: 16,621
As far as TDS readings that pretty good. The problem is TDS is not a measurement of specific contaminants, you have no idea what makes up that 90 ppm TDS reading. It could be all copper, nitrates, silicates, phosphates and combination of all of the above or something entirely different. TDS is an indicator only. It tells you there is something electrically conductive in your water but not what it is.
Would I drink it, probably so. Would I put it i my reef tank, definitely not.


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