salt level

[2vetts]

i check various parameters of our pond water once a month and find that salt level drops every month and other figures don't change . i know salt does not evaporate with the pond water . i'm quite sure we haven't a leak . i can't think of an explanation but tend to over look the obvious [the obvious is not always readily apparent] . thoughts are welcomed . . .peace

[Tadpole]

You are absolutely correct. Salt does not evaporate, so you are losing water somehow. My question is--Why would you want to maintain a salt level? Parasites, over time, will adapt to an increased salt level and at a certain point it becomes a stress factor for the fish and other pond organisms.