OasisKeeper
Aquarium Advice Activist
Speaking of chemicals. I Nvr use a dechlorinator. I just let water sit out. That should be fine rt?
It depends. If you water supplier/company injects regular chlorine, it will work fine.
If they use Chloramines, which many are using now days, then no. They are more stable and won't evaporate from just sitting open. You'll need to use a dechlorinator that says it can break down chloramines.
The trouble is, no easy way to know short of calling and asking and then you have to decide if you believe the person answering or not.
Seems safest to me just to treat and be sure.