I was going through my mother's garage and I found two gallons of muriatic acid that my father must have brought home. He died 10 years ago. I don't want to leave it there and I figure a good and easy way to get rid of it is to put some borax in my pool along with the acid. However, I have no idea if it is still the same ph as it was 10 or 15 years ago. Does anyone know?