Instructables
Picture of Mini Hydroponic aeration tower

I built a self watering greenhouse a few months ago. the self watering system has worked OK for the most part... But.. it does develop some nasty green slime in the water, due to lack of oxygen and circulation. My plan is sometime this winter I'm going to convert the still water basins to ebb and flow hydroponic. I only have about 2 amps 12 volts of solar available. So running an aerator with a stone and a pump is out of the equation. Why not kill 2 birds by having the pump do both? I settled on a 12 volt 325 GPH pump that draws around 2.5 amps. I want to keep the head pressure and restrictions to a minimum. So I designed the 4 venturi mini tower aeration system. Based on Bernoulli’s Principal, which states that as the speed of a fluid increases, the pressure within it decreases.

1-30-14, I have an actual system up and running using the mini tower, I made a few changes to the project based on my observations to maximize aeration. My circulating pump, in the system, is about 150 gph at a 7' head.

 
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Step 1: Make the venturi's

Picture of Make the venturi's

I started out thinking I could make these with brass bar stock and copper pipe fittings. Big fail on that. I had loads of trouble trying to bore a taper in the brass stock and only seceded in burning up a not so expensive drill. So a trip to Tap Plastics got me a 2' piece of 1" diameter Delrin plastic bar stock I cut four 4" pieces to start.

astral_mage10 months ago
shucking yr problems there huh chuck.
Mondonson11 months ago
is a cool idea, time wise and with not too many tools it would be asier just to glue a wine aerator to a single hole in the tube
elking (author)  Mondonson11 months ago
No lathe, no problem. My first choice would be to join TechShop and take advantage of all the great classes and tools they offer, including the CNC and non CNC lathes . Choice 2 is search for DIY wine aerator, there are plans for one made out of PVC pipe parts. Choice 3 is use a few common garden hose siphons. I have not tested the hose siphon but it looks like it should work. Choice 2 and 3 will save a chunk of change over using off the shelf wine aerators.
astral_mage elking10 months ago
ehh tech this tech shop that u speak of. theres none over here on the east caost wat so ever.
Orngrimm11 months ago
Simplicity at its best:
- Aeration: Done
- Water-circulation: Done
- Ammount of pump-systems - One: Done

May I ask about the noise-level of such a thing? Does it bubble a lot or could you think it can be (sound-)isolated to be used near a veranda?
elking (author)  Orngrimm11 months ago
It makes just a slight amount of noise similar to a wine aerator. The 12 volt pump is very noisy. A small 110v submersible pump would be much quieter.