Since a lot of people are complaining with bell siphons, I did not bother with building one for my grow bed inside a 6×8 feet greenhouse. I chose to build a simple spiral siphon, easy to start and easy to break. Here is the video (if you live inside China and can understand Chinese, click here to see video served from QQ):
Normally, with the so-called u-siphon (this is the video where I got inspired from) made out of a few elbows and two 45 degree PVC connectors, it is easy to start but hard to break the siphon. But after playing with it, I came up with this simple design.
Instead of installing it inside a grow barrel, I installed it outside to make everything external. This change is make everything super easy.
If you prefer to watching the video on Vimeo, please click here.
Before I came up with the version I call “DripGrow Tower”, I had tried several versions, some of which you can see in the video, including one made with a long bamboo pole. The time I spent the most was on various kinds of airlift pumps (some are shown below). Eventually I found that the simple airlift pump made with a T connector works the best.