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RE: Reconstituting RO/DI Water/ RO Water comes in at 5.5pH

As a support for this statement, my r/o water usual reads from 5.5 to 5.9 after I've gathered it in a holding tank. As I said earlier, my unit leaves enough in the water to have a conductivity of about 20µ -- enough, I assume, to get a relatively close reading with my probe.


At 12:43 PM 3/25/2002, you wrote:
_Pure_ water has a pH of 7.0.  But that's an extremely difficult
measurement, and almost irrelevant for fish-keeping ('cuz anthing else in
the water will change it).

Breathe on it, and you'll lower the pH... to about 5.5, which is the pH
you'll get with atmospheric CO2 dissolved in it ;)

michael kahlow

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