Thank you so much for chiming in Ben!
I do have a heater and have not put anything in the pool except bleach and chlorine granules since opening 3 weeks ago. Shortly after opening with just the above and a clear pool, I started seeing the brown stains, picture enclosed.
I noticed pH was way low and TA was 50 and added two boxes of Borax and pH didn't budge.At that time I took a sample to Leslie's and bought their TA up stuff. Added 10 lbs of that and nothing changed.
I then posted here and the rest is on here. I will keep filtering and leave the borax.
These are the steps before agging the additional borax.


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