Quick follow-up. The DE filter crushed the iron precipitate and cleared it right up. I had to backwash it a couple times. I drained the pool about halfway and had city water trucked in then initiated the SLAM. The SLAM process went very quickly and I am now burning off the excess chlorine.
I plan to use up the extra bleach then replace my SWCG with an RJ60 instead of just replacing the T-Cell 15...a new RJ60 at DSP is about 2x the price of replacing the T-Cell 15 but generates significantly more chlorine and has a much longer warranty. We'll see how that goes. I am still raising the salt level and TA is still high but Pool Math says to lower it with acid and aerate, which I still need to do. The pool looks fantastic with no algae.
Sounds great! No reason to push the TA down unless you find the pH rising very fast.
Now for my cheesy sales pitch ----
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