Agreed with Brett, I switch out the resin when the TDS outputs anything but zero.
Ironically enough with the colour changing resin, the stuff I have right now changes colour well before the nonzero TDS reading. So the colour changing stuff is a really just a rough approximation if anything.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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