i have a meter sitting on my up out from the RO menbrane and then a meter coming out from the DI so I know when the membrane is gone and the DI is going. I usually go until its at 5 for a reading but just remember that if you have a DI container at the end of your RO system to polish the water. the longer you wait to change the membrane the faster your DI will get exhausted
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180 starfire front, LPS, millipora
Doesn't matter how much you have been reading until you take the plunge.
You don't know as much as you think.
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