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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

Early designs

Designs

Concentric well screen filter designDesign Phase 1

We've attempted to model the headloss through the pipes and orifices:

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