I really like Ross' suggestion, and not only will it be overall better for the plumbing, cleaning, etc., as the softener has already done some of the work, the RO system will last longer and be more efficient.
As to the KCl question - I don't know if high chloride levels are an issue (they might be), but high potassium is not.
My well water has a pH of about 5 (+/-0.3), so we have been injecting a potassium carbonate solution into it to neutralize it. It's not good for tropical fish, but plants, 4-legged pets, and people have no issues.
I am considering replacing the injector with a dolomite neutralizer, but recognize that will give me the hard-water problem to remedy...
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