Backyard Aquaponics
A place to discuss aquaponics

Or you can make a HBO generator and power your system with it. Goggle Stanley Mayers for more design ideas. I think Steve was the guy here that built PVC splice cones.

Those oxygen concentrators are pretty simple in theory, they just use zeolite to absorb nitrogen, so... Why not pick up a small car compressor(like plug into a car, 12v, and Schrader head) and, say a used Coleman propane tank that's all the way empty and tinker around? You might be able to make an approximation that doesn't use too many amps, that could run off of small pv panels.

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http://hackaday.com/2014/05/23/homemade ... -nitrogen/
not quite the same thing, but it does deal with scrubbing elements from the air, so... Food for thought.

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Just think you could pump pure oxygen into your icecream now that's a thought

I tried to make ice cream with crushed dry ice once.

I made fizzy ice cream, it was weird. But I wish I could make a home liquid nitrogen system, that'd be very cool indeed.

lol colum, 0 kelvin freezer.