but to be honest, i dont have any anti growth things in my loop right now, ive ran it for probably 3 months with just naked distilled water... not having any problems at all. so its not something you need right away.
With me on water you won't stand a chance, sorry mate
and LOL, walmart in Australia? We've got Woolworths or Big W instead. Hmm, what's with all the big shopping chains and the letter W?