Does anyone use this for Brewing? I've used it about 10 times so far for brewing helles/pils and bought it from Bunnings with no side effects. Anyhow thought i'd go direct to the source in Garling St O'Conner ( much cheaper than Bunnings and they sell 25 litre tubs) and the bloke there said you probably shouldn't use it as it might have acid in it. He didn't know what type of acid and said he wasn't totally sure. Anyhow he is going to check witht their chemist and get back to me but I was wondering has has anyone here used it?