Was only able to find about 3 forms of concrete/driveway cleaners between 4 hardware stores. Only one had HCL as ingredient. Only thing is it says contains less than 13% Hydrochloric Acid before diluting. Is this good enough for the I2 crystal procedure?

Muriatic acid usually has 31.45% by volume, and is called muriatic acid.

OK Thanks. I was actually looking for that at the hardware stores (muriatic acid) but had no luck on that either. Im assuming it would have been kept in the same area as all their other chemicals but maybe not.

Its pH adjuster for swimming pools.