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So you are planning to run your compressor at 30PSI? That’s awfully low, I assume I’m not understanding something. Typical 2nd stages on scuba regulators require about 125-140 PSI above ambient to work well. That means if you are down 30 feet, I imagine you’d want to compressor to provide 140-155 PSI to compensate for the depth of the 2nd stage.
My air compressors reach 160psi at peak, and restart at 110. It’s overkill but better to have the extra air than the other way around! They make hookah regulators which run at much lower pressure. Although I have used standard regulators with minor issues before. The hookah system I’m currently building has a feature I’ve never seen on other systems. I call it my dive whistle; as the compressors are doing their business, I have a 1/8” tube, fed from the cooling tank that vents into the water. In testing, it produces a constant “bubbling hum” which lets me know there is still air being supplied and I can hear the difference between air going through the whistle is high pressure (compressors working) or a different tone for compressed air being released but no longer being supported by the compressors. Make sense? And, feel free to ignore my comment, I’m still learning even after 65 years!
