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The goal of our research is to evaluate the feasibility of a siphon-aided backwash design to be used for a sand or mixed-media down-flow filter. The benefits of siphon-aided backwash are:
1) The height of the clear-well does not need to be equal to the the head pressure required to attain 30%-50% expansion.
2) The siphon tube is designed to fill up when the filters have reached a terminal headloss (a set point we determine). Thus, they only backwash when they are dirty.
3) Since the headloss energy is used to prime the siphon, and eventually trigger backwash, fewer valves are required which reduces cost and labor.

How the siphon works

Here is a useful animation

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.

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