Water softeners use salt with an exchange resin to consume calcium and
magnesium, by replacement with sodium, or potassium. The calcium and
magnesium are then backwashed from the water softener periodically. The use
of softened water is not highly recommended. If you can, have an outside
faucet hooked to the water line in front of the softener. Also, every
gallon that is treated, consumes some of the salt, adding to the workload of
the softener. The fish will actually do better, as will the yard, with the
harder water.
--
RichToyBox
http://www.geocities.com/richtoybox/pondintro.html

wrote in message
oups.com...
Our pond has been doing fine for about 1 year, 3 coi, 4 gold fish and
several frogs moved in so we now have about 300 tadpoles. But, we are
finally getting around to getting a water softner system. They work by
addind salt to the water, so when I add water to bring the pond level
back up, do I need to worry about salinity? Pond is about 1400 gallons
and the level drops about an inch every couple of weeks.

Dave