DI resin replacement question

trackfast

Princess Trainer
When do you change your DI resin? When TDS measures more than "0"? Or do some members let it go a little higher?
 
It's personal preference, you can let it go a little. Just because you have a couple ppm of solids doesnt necessarily mean the solids are "bad" for the tank, but on the otherhand if your not sure what is bypassing the filters, a few bucks for new resin is a cheap safety blanket.
 
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