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Most efficient water oxygenation system?

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Hello,

 

I've been searching for threads covering this topic but couldn't find any (my search tool is nonoperational, probably due to forum platform upgrade?); so, apologies if covered already

 

I am looking to design the most efficient system to oxygenate the water of my aquaponic fish pond (Taptim, Nile and plaanai).

I know a few systems: the floating device with rotating blades, basic air pumps, creating simple water falls, or forcing water at high speed onto the pond surface.

 

My question is: what is the system offering the best ratio oxygenation vs power used?

It means I don't really care if it's a powerful device running on an intermittent basis or a light device running permanently; just looking for the lowest electrical consumption while achieving satisfactory oxygenation levels.

 

I currently run 2 pumps injecting a high speed flow into the surface. They run 24/7 and I can go for that but I have the feeling it's not very efficient in terms of energy spent (?). Also noisy at night...

 

Thanks for any input based on your experience or knowledge

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