You are a wise man!
Don't ever be put off by the mung, you just go again at a later time and when you do get into fish down there it will all be worth the mung ruined trips you make!
However next time...pm some of the guys who fish there regularly such as myself, Slingah, Backbeach Jake.We will be glad to give you current mung reports (no spot burning though
). Or just post a thread here a couple of days in advance of your trip down....someone might be able to steer you towards clean water and save you a headache.
