Your water is very challenging. Depending on the age and condition of the resins, a disk seven may work, but you could advance it to a disk 8 (max) if need be later. But you are near the maximum setting for that condition of water. I would have recommended a K-175 but you got yours second hand.
The water should rise about an inch or two above the grid plate.
If it sat for a few months then it won't be hurt. Just put it trhough a couple of regenerations with an iron-out cleanser. Let the salt sit for about an hour or more before putting it forth into another reg. Look at the lens on top of the valve, is it clear? Did you put a prefilter on it?
Andy Christensen, CWS-II
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