The pool is clear after two filter breakdowns and washes.

ph is 8.4 and TA is 50 and the steps etc look like the pictures above.

Free chlorine is >.5ppm, cya is 25.

The liner looks fine also so the blue was most likely a precipiate as per Ben's guess #2, in my opinion. That precipitate that appeared as milky really gums up the filter for future reference.

Please advise what are best steps now to get ph and TA in line and then address the brown stains.

I see Ben advises adding acid now. How much and what kind?

Thank you all for the help
Bob