Question:


What must my TDS reading be before spots start to show up on the glass.



Answer:

I have found personally that any TDS reading in single figures if fine, I wouldn't chance it at 10 or over, although reports from users have said they have had no spotting at readings over 10ppm

The thing here to remember is the cost of DI resin and pre-filter are relatively cheap, and once your readings start to rise they rise quite rapid.  I find that as soon as your reading rises above 0ppm it is time to make the changes to keep it at 0ppm.


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