It depends on your municipal water. If your tap water smell
like a pool's water, you need a lot of that chemical. With
my tap water, the majority of the water come from well. In
this case, aerating the water take higher priority than
treating the water with chemicals. Fish in my area don't die
from Chloramine, they die from lack of dissolved Oxygen.
Chloramine aggravates low oxygen condition. I don't add any
of that stuff when I do 90% water change. Since water is
well aerated coming out of the Trickle Tower, the fish hang
around there for a few hours after water change. They would
die without aeration.

robv60 wrote:

We are about to re-fill our ponds after a draining and thoruogh
cleaning. We will be using city water and have already purchased enough
Tetra Aquasafe to treat the water. The instructions on the back are
pretty clear, BUT, there is nothing in the instructions that say if or
how long you need to wait after using the Aquasafe before you
re-introduce fish into the pond. After we fill and treat the pond, how
long do we need to let the Aquasafe circulate or whatever before the
fish can move back in? Anyone use this before? What did you do?