The system you go for would depend on what you plan to use it for, diving
off the boat, if you have 220 or 120V, or if you want to dive off a dingy .
I have had several on my yacht, i now carry 2, both made by Hookah dive. 1 is an electric
that runs off 12v and I mainly use for cleaning
or shallow dives down to 8Mtrs. it is small and portable so I can throw it in the dingy with a 20Ah AGM battery
it will last for 45mins. No maintenance
and very reliable.
The other is an 8CFM, again an oilless pump so no need to buy expensive carbon filters, coupled to a honda
5HP, its obviously a bit heavier at 20Kg but I can still lug it into the dingy and with a 100Mtr hose can dive to a max of 25Mtrs. Have to be careful of bottom time when using this at depth
With the 100Mtr hose (the longer the better as it works as an accumulator and as long as you have it spooled onto a reel it is easy to manage) if you can anchor
close enough to the reef it is easy to rune the hooka on the yacht.
As it is just a "standard" honda motor
you have to be carefull and not get salt water
on it after a dive as it will corrode pretty quickly, I spend a fair bit of time cleaning
and spraying it with lanoline and so far it is holding up well.
Certainly beats carrying dive tanks
every where as I have no high pressure compressor
to charge them with onboard and the freedom of diving on a hookah is great especially if you are hunting in the caves and ledges for crays, just remember and carry a pony bottle just in case.