For those of you who wonder why you even fiddle with the finicky contraption: It serves two purposes. It pumps the water up to the top of the windowfarm and (most importantly) it oxygenates the water.

The transfer of oxygen from the air to the water through passive means does not deliver enough O2 to the plants. So even though they have all the water in the world, they are sufficating. It’s like a person going all day without drinking any water. They drank tea, coffee, soda, juice, etc, but no water. You’re dehydrating yourself and don’t even know it.

The air-lift method allows you to use the same water supply, only topping it off when necessary. If there were no pump, you would have to use a fresh supply everytime to enusure everyone is getting their fare share of O2.

Anybody have any suggestions for how we can O2-ify our gardens using less energy?

What Dean did/does on Urban Green Survival, with his no pump system, is change the water/nutrient mix after cycling it through his set up 3 times.

Reposting his link:

http://urbangreensurvival.blogspot.com/2010/07/hydroponic-bottle-garden.html

I was inspired to start a window farm after the success of my Father’s automated airlift system.  It is a large 8 foot tall system with an upper-reservoir and is set to only run for a certain period of time every 3o minutes conserving water and energy.  Of course this required some more advanced electronics, but he is wonderful with that kind of stuff and open to any questions you may have for him.  You can find him on windowfarm.org if you search for William Belcher in the members, or you can e-mail him at MrBill731@yahoo.com.  He gave me permission to post some pictures and he will be soon sending me more detailed pictures of the entire system and will be uploading a video to youtube.  I will add further comments to this blog once I receive them, but for now, here are some wonderful pictures of his thriving plants:

I recorded a brief video to document my experiment with an airlift system.

If the video doesn’t show up (the preview certainly isn’t showing it), then you can see it here: http://www.youtube.com/watch?v=Z4xkUsAlM_0

We are building the easier three bottle window farm, and have put it together according to the directions, but aren’t getting a drip!

Should we make sure the needle entrances are properly sealed or make a smaller drip exit?

Help us out!

Sami