Hook up a carbon filter to the hose and forget about adding chemical to the
pond.

claude rogers wrote:

When you guys top off your ponds from evaporation, waterfall spillage and
"splashage" Water changes, etc.
How do you determine how much water by gallons I guess you are putting in.
Reason for asking is I always dump in some dechlor/chloramine stuff,
generally I just guestimate it, is this what everyone else does, oh, and do
you put in it before of after you top off the pond....Claude