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The filter bed rests inside an air-tight container. The influent enters through a port above the sand bed. The siphon is also connected through a separate port, connected to the container, above the sand bed. The clean water exits the container below the sand bed, which leads to clear-well storage.

Flow scheme in regular down-flow mode:
Raw water enters from the top>sand bed>out to clear-well

In backwash mode: The siphon is "primed" by the headloss generated in the clogging filter, which causes the raw water to flow up the siphon tube. Eventually the water begins to flow over the bend of the siphon and as it fills the tube, a negative pressure gradient is established, diverting all flow out the siphon.
Water from clear-well flows in reverse>sand bed (from bottom)>siphon>waste

We've modeled the flow to account for headloss through the pipes and orifices:

wikiupdate.htm

We've revised several designs. Here are a few examples.

A)
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B)
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C)
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