[Ron Reefman]

I re-use vinegar all the time. I do filter it into a separate bottle to store. At some point it doesn't work as well as it should and I pitch it. But I have also used muriatic acid mixed 1 part acid to 10 parts water and it's just a bit stronger than the straight vinegar. And in it's mixed form it's cheaper than buying a gallon of vinegar. A gallon bottle of muriatic acid costs more than a gallon of vinegar, but it makes 10 gallons when mixed to equal vinegar.