Recommend testing the water first! Hope you have the
basic test kit. You'll want to test for:
ammonia, pH, NitrIte, Nitrate and if possible KH.

Nedra
http://www.geocities.com/Heartland/Pines/4836
http://community.webshots.com/user/nedra118

"Michael Shaffer" wrote in message
...
I just finished my stream and veggie pond and filled it back up (bout
4000 gallons). is it safe to put my Koi back in the pond or do I have to
treat the water somehow? I used ground water but it goes through a
filter to make it drinkable.. will that hurt the fish? I really want to
put them back in.

Thanks
Mike