My new TFT test kit just arrived, so (if I have done the tests correctly) here are the first results.
CH 400 (you have to chew tap water in Tucson)
Note: the Ph is low because I have been using acid and aeration to get the TA down from 220 where it was. Looks like I'm there.
So other than keeping the aeration on until the Ph comes down, does this all look right?