Sorry that happened to you. I have never been a fan of the acid etching of concrete. I have finished a few of my own concrete floors (garages and basements) I use an electric floor scrubber with coarse sanding disk, keeping it cool with just plain water (also keeps the dust down). I then use pressure washer with plain water to riinse the removed material. Let the surface thoroughly dry for a couple days (a fans speeds it) and then apply finish.
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