We just had our pond redug, and I'm in a bit of a quandary. We have a recommendation to go with a new Vertex HF4-XL2 system, which I'm sure is a very fine system. My quandary is that I have old aeration equipment from Clean-Flo with 2- 3/4 hp vane compressors and diffusers. Would operating costs be lower with the Vertex? Clean-Flo claims billions of bubbles while Vertex has millions of bubbles. Would lift be comparable for mixing? I'm thinking I'm way better off dollar wise to rebuild compressors and use the old, but I don't know what I don't know. Any experiences would be greatly appreciated. Merry Christmas!