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An Aquaponics Bell Siphon is an elegant way to drain your grow bed in a flood and drain aquaponics system without using a timer to turn your pump on and off. Handcrafted in Colorado. (Note: The design of this siphon assumes 12" of media depth. It will not work properly with more than 13", and can be modified by shortening the stand pipe for beds with less than 11" of media.)