Got my Chinese pump.. and still deciding what I want to do for filtration. Joe's airtanks looks nice.. but expensive. Seems like there would be a completely different way to go about this. I looked up high pressure heat exchangers.. basinlly a large tube.. with many small tubes inside to run cool water through.. and the air would go around. Even with this concept.. for it to work it would think it would have to sweat on the outside of tube.. not sure if it would. Any other suggestions?