The pond should stay salty. Only way to get it out is to pump it out and fill with fresh water.
When I hunted gators in Hackberry, Ted Johanen(spelling) the biologist said that when the sun evaporates water, only fresh water goes up. So the water will get more salty with evaporation.
Only way to get salinity down is to pump out the salt water and pump in fresh water or rain water.
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