This video shows how to make a DIY bell siphon with plastic bottles as well as some PVC pipes and couplings. This is a demonstration for a seventh grade class, and it uses a few plastic drinking bottles. A good demonstration on how a DIY Bell Siphon can be constructed with parts that can be easily obtained.
Once the DIY bell siphon is constructed, the video goes on and shows how to make a miniature aquaponics system from a 5 gallon bucket. The 5 gallon bucket provides two grow beds. The system he shows uses two DIY bell siphons and is a very compact growing system for a small aquarium to supply the needed nutrient rich water.