Caper, I think you have missed the kiwi sense of humour in yarimochi's post and have read it the wrong way.
As to the bag issue. I don't think I have ever heard someone saying not to put the bag in the water. I think what has been said is not to mix the water in the bag with the tank water when you get it home.
Someone who thinks those in the service industry should have a working knowledge of what they are selling has obviously never shopped in any of our chain electronic or appliance stores :roll: :lol: