Poseidon, mythical Greek God of the Sea, also of Earthquakes. I would like to think he was a good old boy and prevented them, however he was also known as The Earth shaker!
But do you know what? I reckon both those titles could apply to the Mk 3 Extreme deep.
OK, lets get the boring technical stuff out of the way first. The first stage is a bit special - 5 high pressure ports and 2 low. It has a truly extraordinary temperature range, from below freezing to +50c, it has a unique built in anti freeze system that uses no fluids, the spring and diaphragm are exposed, and it uses the heat energy in the water to prevent freezing, how clever is that?
There is only one O ring in the first stage, and a built in pressure relief valve in the base of the unit.
The unit is self balancing, using a series of roller balls around the diaphragm. The effect of this is that it will function normally and deliver the correct amount of air, down to 16bar or up to 232 pressure in your cylinder - this means in a emergency you gain an extra 34bar of usable air.,
Enough of that, how does it perform? Well it’s the only regulator rated down to 200 metres and the octopus, unlike other makes is engineered to the same breathing standard as the main reg.
I have now tried it over 10 dives in different condition, from 10 to 40 metres and there is no discernable difference in the breathing, the resistance is negligible, it’s a real joy to dive with, in any conditions.
The purge valve, unlike other regulators, is situated on the underside of the second stage. This means that in strong currents, such as if you are using a scooter, there is no chance of it purging.
The exhaust valve is truly huge and cleverly angled away from the side of your face, so minimizing the bubbles going up your face and it is easily removed to clean away any debris that may get caught there.
In terms of value for money, The Poseidon could never be described as cheap, but for something so well engineered it’s a small price to pay, and as for performance, I’ve never tried any regulator to beat it.
Other reviews to read:
Always wanted some of these
Always wanted some of these regs but could never warrent the expense. Was going to get Cyclon regs but enentually went for some ATX's which have served me well.. I am due for some new regs though. Whats are you views on the Cyclon's.
Hughesy
cyclon vs jetstream or extreme
I have both Cyklons and Jetstreams(not as advanced version of Extreme). I also own a set of Apeks TX50.
I like the Cyklons for photography-they have side exhaust. They are also less bulky than the Jetstreams diaphram second stage, which can get in the way of visualization. I have had to use a Cyklon in a rescue but I always thought that a Jetstream or an Extreme might give a victim a bit of a start-just because they can have that huge WHOOOSH of air when purged. Any of the side exhaust regs are great for rescue because they can be breathed from left or right side.
But to me, and my diving friends who always borrow my regs., the Jetstream breathes better. Cyklons are known for their ability to withstand abuse and muck and grime. But it has been my experience that the Jetstreams out-muck, out-grime and out-abuse the Cyklons. It is true that the second stage on the Jetstream is finicky due to the regulator second stage cover being so important in the breathing characteristics of the reg.-get that cover slightly off and the regulator is way off in breathing characteristics. But once they are set correctly and this is NOT hard to do(the internals of the second stage are very creative engineering-just the pilot valve....so simple it's ingenious), the Jetstream is the best reg. I have ever tried second only to the Extreme.
So, in comes the Extreme. Everything said in this review is true. Every regulator tech. I have spoken to says that the first stage is an engineering marvel. The Extreme is a one-upped Jetstream. But the Extrememe first Mk3 first stage(which a Jetstream can use too) has the overpressure relief valve built in to it...NOT into the hose. The Mk3 also has 5 LP and 2HP ports. And there is the lower profile of the Extremes second stage compared to the Jetstream.
I would my preference in this order-best to least liked: Extreme, Jetstream, Cyklon, Apeks TX50(lots of jaw fatigue, but great reg). But when serviced correctly and at regular intervals they will last almost forever.
Pricey
None of us have tried the Poseidon Cyklon (that's the Spanish spelling) but I'll see if we can get a set to check them out and we'll do a review. I do love Medical Mick's regs, but I agree with you about the price.
Don't tell anyone, but he's a retired police man, so he can afford gear like that!
Scuba Mike
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