MN Lakeman:
All great replys - thank you. Aside from the liveaboard, I rinsed & soaked both my BC & reg set after each dive, & in the case of my earlier resort trip in Roatan, I would bring my reg set to my room each night & soak it in the tub for a few hours & drip dry overnight over a chair. Great tip on liveaboards - I always have a full Nalgene bottle of fresh water. Pouring that over the valve & 1st stage before removing, blowing & capping makes sense. As for the mold - who knows. I did some fall dives in Lake Superior since my summer liveaboard trip, w/ some challenging factors (cold, deep, etc) & reg performed flawlessly w/ no musty smell (?). What are opionions on the comment about servicing more on a so-many-dives basis? How many? (kinda like oil changes w/ a car "3000 miles or 3 months?!)
If you can get past the jerky note (made much worse because you did not have the ability to "see" any of the issues that were presented, there is a very important issue being addressed here.
There are a whole bunch of "things" that can live inside a second stage of a regulator. This list gets a lot bigger if one has been to the tropics. If every one just washes out their second stage with fresh water, about 1 person in 1,000 would come down with some sort of sickness from them. Of those, only 1 in a hundred that got sick, would have anything life threatening (That is guessing that a regulator acts similar to respirators made from similar materials) per year. Pretty small odds, so small in fact that one could believe that there is no risk.
If you wash the second stage with any common detergent, you have roughly doubled your chances of getting something - still really small though.
If you assume that there is nothing for anything to grow on in a regulator, you would be wrong.
If you assume that this is just a mold issue, and that the regulator would smell musty, you would also be wrong.
What can grow in a moist, organic area (this includes plastics and all of the various types of natural and synthetic rubber are:
1. Fungus (mostly molds, but yeasts and actual bigger members of this family)
2. Water/Slime molds (not a mold at all).
3. Bacteria.
The fungus family is known for the alergy issue, but some members of it can live in lungs. Rare, but not something anyone would ever want to get. I have seen 5 cases, 4 in Panama and one a year ago in Michigan (sold fire wood as a hobby and wore a resporator when cutting, but never really cleaned it well)
Slime molds are common almost everywhere, but very little is known about how they effect humans. They do, as a family, usually only live in low pH enviroments, so they are the least likely to get.
Bacteria are the big worry. One of the most common US ones forms a black sticky substance, that looks a lot like oil. The bad ones are really bad, typically have no smell and can kill.
On a dive trip, there is almost no chance of this being a concern, there is not enough time. The concern is when one puts the stuff up and then comes back months later.
For a dive shop, not telling you could potentially make them libel for that 1 in 100,000 chance.
If you want to remove this concern, then soaking in a real bactericide/fungicide at least once a year should be done and twice a year is a really good idea. I don't use a retail product, so I don't know if any of them work better, but I see they are available.
I assume the discoloration that was listed was from soaking in a bleach/peroxide solution, or similar product.