AquaParts Aquaponics Bell Siphon with View Window A 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. No more timer - You will no longer need nor want a timer to control your pump. Pumps that run continuously suffer less wear and tear. This may result in a longer pump life. Using a siphon to drain your beds will increase the aeration you deliver to your fish tank. Features a view window so you can see the physics in action!