Paint removal from concrete in basement

Hey anyone,

I need to remove many layers, about 5, of paint from the foundation wall of my 1000sq ft basement, in my 1900 year old house. It's along story, but an idiot painted them with an exterior paint (this is an interior) that I'm highly allergic to. I tested the peel away one on the walls and it worked well, took off all the paint in the test strip. I am concerned about using such a large amount of a caustic product in my interior space. There is a basement drain, but I'm assuming that all of the floor paint will come up if I wash the residue of the peel away product off the walls. I am, also, concerned about neutralizing with the acetic acid (it's required to get the ph down so that repainting will stick, the msds makes it sound pretty nasty. I've looked into sandblasting but it's huge amount of space in a big space with some potentially old paint.

Anybody used this product on a large space in an interior space? Advice? Contraindications. Help!!!! Thanks