It is generally not recommended to use more sand than the manufacturer suggests. The filter is designed for a specific amount of sand in the tank (in order to get the proper flow rate, filtration, etc.) Too much sand would likely slow down the rate of water passing through the sand and increase the operating pressure on the filter, as well as cause sand to leave the sand pool filter when backwashing.
However, I would find it somewhat unlikely that they could actually get 500 lbs. of sand in that tank. (Assuming they’re using the correct #20 sand) The proper amount (350 #) should bring the sand level to within 6″ of the top of the tank, (from the manual on that filter) so there probably wouldn’t be room for much more than that. They may be mistaken…
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