Rainman, is this something I can "see" to better understand?? I'm interested.
I presume you are using a 2" PVC discharge pipe.....If you upsize to a section of 4" PVC, you would have space to put a ceramic Oxygen diffuser in the larger section. You can rent Oxygen Bottles or Dewar LOX tanks at any welding supply. Install a bulkhead nipple fitting for the Oxygen, add a regulator and adjustable flow meter and your water could be saturated with oxygen when entering your pond.
These are the diffusers....
https://pentairaes.com/point-four-micro-bubble-diffusers-mbd.html They are not cheap. but a must have to diffuse pure oxygen,,,they produce bubbles in tiny micron sizes that easily dissolve into the water.
