Bought a new carton box containing 2 1-gallon bottles of muriatic acid from the local pool store, in order to keep the PH of my in-ground saltwater pool in check. Usually, theses bottles are sealed by a metallic cap under the screw-on-lid, and the cap is normally not easy to remove.
This time however, after unscrewing the top lid, I found the seal already loose and somewhat corroded looking.
Is this still OK to use? Don't feel comfortable putting something into the pool that possible already has tampered been with. Or is that normal, if maybe the bottle has been sitting for a long time on the shelf. Now I remember that the tape on the carton box also did look as it had been opened before.
What to do, any thoughts....?