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Gday Geoff
Another thread ages ago also recommended using a sand/sump oil slurry as the fill, as the oil creates a good mechanical join to the pipe, and thus helps transmit energy out of the pipe to the slurry much faster.
ie Same theory as using heatsink paste to assist temperature transfer between 2 ( almost) flat surfaces, but in this case its helping the mechanical energy transfer.
Never tried it tho, as my pier is solid concrete.
Andrew
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