Pond Boss Forums AERATION Systems questions Should I add water at the surface, or below?

My venture works great. In my situation, I have thick walled 2"ID Flex tubing running from a water well that produces 65 gpm @ the well head. The well water has a 7.2pH. Water hardness is 20ppm which is a little low for raising fish so I add agg lime to increase the water hardness as needed. I am at 50ppm hardness in the pond. To add air to the well water before it enters the pond I laid the 2" Flex tubing on the ground (12 feet from the end of the tubing) and drilled a 3/4" hole into the top side of the thick walled tubing. I then cut a 6" piece of 3/4" steel pipe and using a grinder I ground a 45 degree cut on one end of the 6" pipe. I then drove the ground end 3/4" pipe into the drilled hole in the 2" tubing until the 6" tagged bottom of the 2"id tubing. Keeping the 3/4" pipe longer side cut upstream. This causes the water to pass around the 6" on both sides and will make a suction in the 6 pipe, where air is sucked into the water before it hits the pond. I can place my finger over the top of the 6" and not only do I feel the suction but the water coming out of the two inch looks to be aired up or frothy looking when the finger is removed from the top of the 6 pipe. I will also let the water hit some rocks at the water edge for additional splashing to add some more air. I am no expert but this worked for me and maybe it will work for others.