just get a pond salt test kit. they are cheap and more accurate for
our ponds. Ingrid

On Thu, 28 Jun 2007 02:15:03 CST, "George"
wrote:
You can get a
hydrometer pretty cheaply at a pet supply shop and find out. Make sure you
get one with as wide a range as possible. Or better yet, just ask your
water authority what it is supposed to be.

George