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Deryk, i suppose divers use them because they see dive boat crews use them . We ( my crew and i) use posiden regulators because during working dives a finely tuned posiden is the only regulator that has proven able to supply extremely high volumes of gas at a low amount of inhalation and exhalation resistance at depth . every other kind of supposedly deep diving regulator gets overbreathed , causes a co2 build up , you have to stop work and rest before you can resume work. Now please note i am not talking about ordinary sport diving but the all-out , full-bore exertion required to swim a thirty pound grapple and thirty feet of 1/2 inch chain attached to 3/4 inch nylon anchorline sixty or eighty feet up the side of a wreck in 130 to 270 feet of cold , dark water, in a current and secure it to a sturdy portion of the wreck with a big one inch crosby shackle. while burdened with back gas , stage bottles and tools. We need to get the job done quickly , efficiently and do not want to fiddle around with lift bags , stopping to rest , or any other delays and can not spare a big team off the deck and into the water. everyone in the crew are powerfull swimmers and such exertion needs a lot of gas to flush away co2 . I have used mine commercial diving even wrestling with 10 ton lift bags under a frozen river. Posiden regulators are expensive , expensive to maintain , tolerate no abuse , have no tolerance for dirt in the second stage , the large exhaust diaphram is easily hung open by debris and the regulator should be washed while still pressurized on your tanks, so wash water dosn't run back up into the second stage mechanism , they have a high intermediate pressure compared to other regulators which is hard on the hoses , and only posiden hoses fit , only posiden mouth pieces fit , and parts are expensive and a poorly maintained unit will dump your gas at a spectacular amazing rate, and i have recently discovered they free flow briskly when hit by the prop wash from a scooter :) .. i have never had one in 22 years fail closed , any problems i have had have been a spectacular run-away free flow, (which motivates you to be able to reach your manifold valves) but that dose not mean it won't happen tomorrow , that is why i dive with two . -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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