The pond is at the lowestpoint,but it does seem what ever it is canot
get to the top pond, via the pump and filter. this ring any bells ?
salt also seems to hold it off for a few months.

joe wrote in message ...
Yes, good thinking. Something heavier than water. Perhaps you could get a
pump to the lowest point of the pond an pump out some of the water. Don't
forget to add dechlor when you add water.

Joe

dkat wrote:

If you are only having die off in the lower pond, then I would suspect some
type of ground runoff (pesticide?) that is collecting in the bottom pond but
either from the filtering or exposure to air going into the upper pond does
not or has not to this point made the concentration yet to bother the upper
pond....



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