our city water is very pure, and it comes from a local river. i've
never had issues with putting fish in it or any chlorine related
issues. i wouldn't recommend chemicals to remove chlorine. if you fill
the pond up and wait 12-24 hours, the majority of it will just be
released from the water... if it smells like a swimming pool you're
gonna want to run it through a good charcoal/caron filter.