Vacuuming Sand on Pool to Waste or Backwash Water, Pressure Immediately Drops to Zero

- Image by Joe Shlabotnik via Flickr
Because there is a bunch of sand in the pool, if I vacuum in the filter position, most of the sand particles come back in the return flow. When I try to vacuum in the backwash position, I lose suction almost immediately.
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Vacuum in waste, not backwash