Can I retrofit a softner by changing the media and settings on the existing valve? I am replacing a failed MacCleens unit, I also have aquired 3 old softners One 3210 valve and timer, two 3200 manual timer. Also the maccleens unit has a 2510, but it leaks and needs to be rebuilt. Ihave two 9x44 tanks and 1 12x48 (old MacCleens unit)
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