When is it time to change filters on a Nanopure diamond based on resistivity values.
Date : 5/19/2014
From :
Jim
Question
For the Nanopure Diamond water system, at what Megohm-cm reading should I change the cartridge?
Answer
The filter, as with any deionizer will run about 90% of the bed at 18.2 megohm. Once it starts to drop it will fall quickly. You would change it when your value is close to the water spec you are using. For most labs, an ATSM type I water spec is used which is 18.0 megohm so as soon as it goes into the 17's it is out of spec.
It is also important to know that once a deionizer is exhausting, it first releases silica and then sodium. This is called silica breakthrough or sodium breakthrough. It may not show as very conductive until it is in the P.P.B. levels. If your work is sensitive to either of those, then it would be important to change the filters before it drops more than 1 or 2 tenths on the resistivity meter.
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