True-dat.
But since it's already installed and working-mostly, fixing minor issues like this and getting the full lifecycle out of it is a better choice than just scrapping it (at least most of the time.) He's asking how to deal with it, not whether it makes sense to install one. TK3s will hang in there for a good long time in naturally-soft water country with fairly minimal maintenance, even if there's no "payback" in a financial sense on the somewhat higher efficiency.
This is awkward, but...
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