I have a 12V Hookah Max. I have run 2 divers at 25 feet a few times. It works great. NO problems and pretty easy on the battery. Battery life will depend on you and other divers breathing habits. Breath less air and battrey works less. I have 2 (100ft) hoses running off a deep cycle marine battery. My buddy and I dive for about 3 hours before battery runs low, but I can dive 5 hours by myself....I made a wood bottom and wrapped a noodle around the edges to keep from possible cutting or poking the blow up boat. It is very stable and works really good here on Cayman Islands. We do not see the wave action that most beaches in the states see, our water is calm like a lake, only crystal clear. I have some videos up on youknowwhere....just search caymanlostandfound or metal detecting grand cayman and they should pull up. PM me if you have any specific questions. I have a video I will try to get up for you tonight or tommorow with us using the hookah and it's set-up.