jawbone's Fish Kill: I doubt that salt will kill the fish when springs are seeping into the pond....BUT it may work depending on how much water in in the final puddle. May take lots of salt? Some fish will probably seek refuge in the incoming water that will dilute the affects of salt or any other chemical including rotenone. If I were killing the pond for him I wouldn't guarantee my efforts with those incoming springs. Problems with that one.
Instead of salt maybe hydrated lime (quick lime/calcium hydroxide) pretty toxic in high concentrations; raises the pH. Need to know the alkalinity and water volume to determine amount to apply.
