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Re: DIY - discussion on building a DIY hookah diving compressor
"from a reputable dive shop"
There are many industrial suppliers for the food service business, and they deal with FDA and similar approvals all the time. Dive shops? Reputable dive shops? There are some, but there are also a lot of gamesplayers at dive shops. Guys who bought into the dream, got bitter trying to make a profit, and now running their shop by any means they can. I know one that does a "VIP Plus" on every tank--including the modern steel ones it is not needed or suitable for. And he charges extra for it.
Then there are the hydro shops, who you would expect to be even more reputable than the dive shops since a hydro is so critical. Ever try to get a "plus" hydro on a tank? DOT says all a tech has to do is run the higher pressure, do the math, and stamp the tank if it passes. But no one will do that simple thing, apparently because the "+" punch tool would cost $125, and then they'd have to offer two different services with all the attendant chances for mixups. So they all (all) lie about how hard it is, or how regulated it is.
Reputable? Eh, the guys who worry about food inspectors sound more reputable to me.