"WilsonKKW" wrote in message
...

How many gallons does your pond hold?
ond holds 5000 gallons
Maybe not. How much are you adding?
adding about 250 gallons

250 gallons out of 5000 is about 0.5% of the pond's volume. According to
the EPA, drinking water has a residual chlorine level of 0.2 - 6 mg / L. For
the sake of argument, let's assume you live in area that has a higher
chlorine level.
See: http://www.epa.gov/opptintr/chemfact/s_chlori.txt

250 gallons of water gives you 5678 mg of chlorine. Diluted into 5000
gallons of water, that works out to 0.3 mg/L, which is pretty low. If the
water is being circulated by a pump over a waterfall or some other water
feature, the chlorine will dissipate in an hour or less, plenty of bacteria
in the pond water for the chlorine to react with.

If your tap water has 0.2 mg /L chlorine, then your pond will end up with
0.01 mg/L, which is really nothing.

If it helps you sleep at night, toss in a bit of dechlor as well, otherwise
I wouldn't bother. On the otherhand if you filled up half the pond, then I'd
say toss some dechlor in as well.

Snooze