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There are odorless substances that are very dangerous, even in small doses.

I should have told you before you bought them, I guess :/
They should be ok for showering and such things, but didn't you also have a well?

I do have a well - but the ICBs are for storing water quite a way from the well - I want one up by the house which is a good 300 meters away up hill!

The guy that delivered is well known locally so I'm sure if he had a reputation of delivering toxic storage containers I'd know about it!

I'll flush them through a couple of times before using them just in case - plenty of rain forecast in the next week!