Quote:
Originally Posted by lastlight
I find my colour-changing resin isn't entirely changed once the tds meter starts reading 1. There are pockets of 'new' coloured resin still... I give the canister a bit of a shake and this gets me usually a few more hours of zero tds but then I replace the resin. I would trust a meter more than the resin's colour if possible.
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Yes but I think rastaangle was looking for an alternitive to check DI resin as mentioned their collecting the RO/DI water in the same container as mixing salt in therefore not getting a proper reading on the tds meter. Try collecting a sample in a clean container then doing a tds check on it to do it properly.