Im using a couple of those containers as fermenters had no problem with the chlorine its highly soluble and rinsed out okay make intersting fermenters with that cap on lid as well as the screw top regards
I'm letting mine sit for a few days with a bicarb soda solution - apparently that's the go for absorbing any badness from the plastic. I'm going to drill a hole for an airlock, and I'll need to put in an o-ring or vaseline in the lid because it doesn't look airtight as-is.
It's a pity they're not translucent, otherwise they'd be perfect.