You can make an estimate of the volume that you are replacing, the
conversion is 231 cubic inches per gallon. If I am replacing less than 10
percent or so I generally don't add any dechlorinators.

"claude rogers" wrote in message
...
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