We use a mag drive 2400gph small pump connected to an oxygen concentrator. This small system (with our patent valve) will maintain a 50,000 gallon fish tank for $1/hour @10ppm D.O. It can go as high as 28ppm D.O. for agriculture purposes.
We also offer 400gpm (500,000 gallons/day) oxygenated water pumps for salmon farms.
Plants can utilize up to 22ppm D.O. at the root level. Low oxygen levels enables the growth of root pathogens in plants, so higher D.O. levels is extremely important. Many people let the plant roots dry out often to get oxygen to the roots. We find that you cannot overwater plants with high D.O., in fact the plants thrive. Last week we had heavy rain for several days straight, my plants, tomatoes etc were water logged. I knew it would take days of sun to dry out the roots. Instead poured lots of oxygenated water on the plants and they lost their 'droop' within a few short minutes.
Fish cannot take more than 12ppm D.O. Any higher and they get an air embolism around their eyes. However fish need D.O. for digestion, for example we have clients that operate dozens of salmon farms. When the D.O. goes below 6ppm, the fish stop feeding, resulting in massive loss of growth.
If you grow your plants using a volcanic rock base medium, the medium will actually thin the water as it percolates down. By the time the 22ppm D.O. water reaches the bottom of the plant, it only has a 9ppm D.O. level.
To conclude, we are testing this for aquaponics, it offers a way to grow plants faster using oxygenated water, and maintain healthy D.O. levels for bio aquatic life.
Our greenhouse customers, aquaculture clients see big gains with oxygenated water. Aquaponics is a perfect fit.