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hi mike
can i recommend a little experiment, not here to start any arguments had my hands full at koiphen.
On your very last tray where the 2 4 inch pipe are plumbed in try, raising the media by putting like a plastic grid that has large square holes below the media raise it around 2 inch with your 5000 gallon flow. The purpose of this is to lift all media of the floor so that none is submerged.
After that see whether this any sediment left besides the white grit or any sediment on the pond floor or drains. When you have tried it for a few weeks i will tell you why i recommended it.
hope it helps
tewa
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