Quote: (Originally Posted by
Mdemon)
I'd love the Boris to be the new Mk15 for everyone to aspire to, but it does seem strange that APD have sucessfully used water traps and scrim to stop cocktails for years and yet these concepts haven't been ported properly to the Boris. At twice the price.
I'm sure Boris MkII will be better.
Boris membrane works fine. It does stop a full cocktail.
I had 2 loop floods last week. One was a total flood with scrubber full of water. The membrane stopped the cocktail.
Despite what people have said you cant get a cocktail back through the exhale hose - the check valve will not allow that to happen (fill a hose with water and test it for yourself by breathing into it) . So the only source of a
cocktail is through the scrubber membrane - (which is hydrophobic) into the inhale lung and into inhale hose - so that cant happen. But the membrane is not (yet) sealed water tight into the scrubber so there is a very small amount of leakage (from a filled scrubber) around top and bottom of membrane, but the amount of water is very small (just enough to get a taste) In my case I got about a tea spoon full of slightly caustic tasting water out my dsv after flooding then clearing the loop
In my case when I opened my scrubber after flooded dives the water in the dome was only very slightly caustic - certainly not enough to burn - just sting cuts on hands a little.
On long cave dives now, Ive started/will be, every so often momentarily over pressurising the loop (by squirting in dil) whilst swimming/scootering along horizontaly to clear any water that may be gathering in the exhale lung through the opv - just as a precaution against water ingress from any source. But I will also be looking at a mod to the opv, although to be fair that only fails when the unit is dirty (muck in exhale lung)
What I was happy about was that I was able to completely recover the loop and flush all the water out practically imediately (this was something not possible on the MK15 series units, and hard to do but not impossible on YBOD ) a vital feature for cave dives IMO. As soon as I realised the exhale lung and scrubber was flooded (very very high wob) I stayed horizontal and flushed. All the water came out and I didnt even come off the loop. I gingerly took some breaths but found no caustic coming thru. The scrubber was fully waterlogged though so the wob was quite a bit higher (but likely breathable) it also seamed to be scrubbing co2 reasonably ok but likely best to run semiclosed.