"NetMax" wrote in message
.. .
Generally, we can only report our observations, but I did ask Hagen's
'fish expert' on this one when he did a store tour. He indicated that it
takes less than 10 minutes to detoxify chlorinated or chloramined water
with their product (and he didn't indicate that there was any time
difference with other manufacturer's products). He recommended adding
the de-chlor to the tank leaving the filters running (to evenly
distribute the active molecules).

I've tried TetraAqua's AquaSafe and currently use Seachem's Prime, and I
usually add it to a bucket of water and let it age overnight.
The next day, there are many bubbles at the bottom and along the interior
sides of the pail of water.
I stir up the water to drive those bubbles out, before using the water in my
tank.
What are those bubbles? O2? CO2? NH3/4?

I figure if I added the de-chlor directly into the tank with water straight
from the tap, all those bubbles would be liberated into my fish tank water
over time, which may not be a good thing.