I have a small pond and run an air pump for about 6 hours in the middle of the night. I first started with the Blue Diamond ET80 and am now using the VEVOR 109L pump. I have the same problem with both, my pond is ~400' from the pump, so I can only put the aerator/bubbler down about 4' to get bubbles. If I go down to the desired 10', the pumps don't have enough power. I need more power and less CFM (I can run it longer). Any suggestions on a more powerful air pump? Thx guys.