This is the sketch of a simple aquaponics setup, this set up make use of my bell valve. This valve is not the same as those using a tube from top of the bell dome runs down the side to cut off water.
This one use the venturi adapter to start and stop water without any other tubes.
Above diagram is the setting of the system.
The above diagram, shows water level equivalent to stand pipe height. At this point water started to overflow and start the siphon action.
Diagram above shows, water reach the lower level, where it coincide with the bell inlet, air start to go in and break the siphon.
How to make the Bell Valve ? Check it : Here