Filtered water?

[flybyferns]

I normally use rain water for my frogs, however it hasn't rained for ages and I have now ran out
The water needs changing but I have nothing to replace it with. I noticed on the side of the box of my water filter it says it reduces chlorine and heavy metals such as Copper, Lead etc.
Is this water safe to use for my frogs?
I think it still contains chlorine and heavy metals because it only says it reduces them. Perhaps if I filtered the water a few times it would be ok.
Any thoughts?

Luke
I use a brita filter on the tap/faucet AND this :
Amazon.com: aquatize

very informative !:
http://www.frogforum.net/vivarium-te...hing-else.html

Lynn