how to make bell siphon for aquaponics garden using PVC , u siphon you need also for hydroponics, I'm showing the best bell siphon design , and how it automatic work to make the best aquaponics system , can use indoor or outdoor , to drain your growing bed . things you need : _ 30 cm of PVC pipe 82 mm _ End Cap 82 mm _ 20 cm of PVC pipe 50 mm _ End cap 50 mm _20 MM PVC TANK CONNECTOR _ 20 MM PVC ELBOW _ 20 MM PVC P/T SOCKET _32X20 PVC R/SOCKET _20 MM PVC ELBOW _ 2O MM PVC pipe _ growing bed