If you do eventually go the muriatic acid wash route and I hope not the following advice given to me by "A Good Pool Maintenance Person" might help avoid a serious problem.
He stated that as the acid is very strong it is a good idea to put soda ash or borax in the bottom part of the pool with water to neutralize it. It could possibly burn out the bottom of your pool with such a concentration of acid. Not a bad idea. Personally I have never tried this but this person stated they had seen pools cleaned this way and the gunite was nearly completely eaten away - scary.
Short story on Borax, 16 years ago I visited the mine which if I remember correctly is in or around Death Valley, it is huge, four story dump trucks look like little toys even the massive dynamiting explosions just appear as puffs of smoke. Worth visiting unless the following happens. We went in July and the temperature was around 115 F. We rode in a bus, upon leaving the mine to return to LA the air-conditioning in the bus broke down, some of the persons from the local Rotary Club were older than 75 and some near 90, they were not in good shape. So most of the afternoon and evening were spent at a hospital that was not too close. So do not go there unless you have A1 air-conditioning, are travelling in Mariah Carey's personal road bus, or have a stretch limo with a refrigerated pool in the back.
Any thoughts on the soda ash borax idea from other members would be helpful.
And finally remember "You can take the iron out the walls but you will never take the iron out of the water." Someone, I think it was my mother, said something like that about a cute girlfriend I had when I was young. It took me 40 years to find out she was right but now all I have to worry about is iron.

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