Just wondering if anyone has built a hookah system for diving under the boat, hull cleaning etc? Good quality off the shelf ones seem to run into the thousands. Cheap ones probably don't provide enough air to do anything but glide around looking at fish in shallow water. There seem to be two approaches at the breathing end, one is just a snorkel which releases any excess air, the other is a stage two SCUBA regulator.
I dont know know anything about SCUBA diving, just done a couple of resort dives. Breathe out on the way up and don't rise faster than your bubbles.
Use an oil less compressor and food grade or proper dive hose.
Thatsts about as much as I know at this stage. But yes I'm planning to put something together.