Bell Siphon the Belle Siphon

One of the most fascinating parts of the aquaponics system, other than the fish, is the bell siphon. The most detailed and complicated part, the bell is built out many little pieces that work to achieve the siphoning effect. Water from the deep water tank slowly filters down to the media rock bed, causing water level to rise. Once the water level reaches the top of the siphon, it starts to overflow into the siphon. However, by having a cap on the siphon, a low pressure area is created inside the siphon, drawing up water from the rest of the bed. As the water is constantly draining out of the siphon, there is constant low pressure inside of it, meaning the siphon continues to draw water until there is none left in the media rock bed and the pressure equalizes. The water then trickles back in until the bed fills up again, triggering the siphon once more. This fill and drain cycle is known as “ebb and flow.” It is important to have ebb and flow because there are various plants that require their roots to have access to air. Some essential, and harmless, bacteria also require access to air. Having ebb and flow allows the system to accommodate these plants and bacteria, which are vital to maintaining the system. So next time you see the bell siphon in action, take a moment to appreciate how much work the little guy does!