I can't stress enough make sure you use calcium carbonate and not cal/mag. The magnesium can be toxic and be a time bomb if your PH swings in the future with muck on the bottom of the pond.

You can't wreck anything with calcium carbonate. You can't have to much. It is a natural buffer and trys to bring you PH to 7.2 all the time.

If you can't get calcium carbonate and only dolomite lime then make sure you get samples and put in only the recommended amount.

Cheers Don.

[Linked Image from corvettejunkie.com]
http://www.pondboss.com/subscribe.asp?c=4


7/8th of an acre, Perch only pond, Ontario, Canada.