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#1
04/10/2005, 04:32 PM
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High pH of RO/DI
A collegue of mine has asked if a pH of 12.5 from his RO\DI is right.
Anyone? Dman
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Prisoner Number 642 On parol for reefkeeping Currently doing "time" in a medium security breeding facility for the terminally insane |
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#2
04/10/2005, 11:44 PM
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A pH probe cannot measure the pH of RO/DI water. It does not have any buffering capacity and the reading will likely be either fluctuating wildy or off the chart. Tap water can be somewhat alkaline or acidic and have a low/high pH depending on the source.
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Have you checked your Alk lately? Adequate Alk level is more important than Ca level... |
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#3
04/11/2005, 06:07 AM
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I agree that pH meters and kits donot read DI water well. But a pH of 12.5 is so high that it may be real. If one part (the cation binding part)of the DI resin became depleted before the anion binding part, then you might get a lot of hydroxide coming out in the water, and the pH could be very high.
Can you measure conductivity or TDS? If it is 0 ppm or 0 uS/cm, then it is not likely a concern. If the TDS is higher, then discard the DI resin. In general, I would replace the DI and see what that does to the pH. 
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Randy Holmes-Farley |
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