I want to agree with everything I have read here about not using phosphric acid. I use a solution to remove lime scale from ice machines of a certain manufacturer. It will ruin some machines. It is dangerous stuff and you want to be sure no other chemical is present. As careful as I am and as long as I have used this product, I nearly chlorine gassed myself to death just recently, and all because I neglected to rinse my measuring beaker. I was using sodium chlorite as a sanitizer and poured it into the measuring beaker. The beaker was EMPTY, all it took was residue. Don't have any sodium chlorite around? Bet you do. It is called clorox.
