I wouldn't bother to splash it. Then you're only adding O2 to the well water itself. If you buy a cheap sweeper nozzle and place it 1/2 inch under the surface and run full pressure, parallel to the surface of the water, you aerate BOTH the well water and all of the pond water that is disturbed by the agitation and circulation. In my opinion you'll get way more O2 mixing this way. My DO readings last summer went through the roof went I changed to this method. Lusk was out here taking pictures of the process last week.

I've now gone 12 months without losing a fish to O2 stress, which for me is pretty dang good.

Holding a redear sunfish is like running with scissors.