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In conjunction decent dive planning software for Trimix (such as MultiDeco in Buhlmann mode) and appropriate conservatism adjustments to more or less match the software's schedule, with a backup air computer (acting as a bottom timer) and a laminated set of tables for Buhlmann, *I* would run a...

That is great news. Your asking price + $78 is still a good deal for a solid trimix computer. Unless it's $78 per PIN and you need a bunch of them. For mine there are five: C4 (Open and closed circuit Air, Nitrox, Trimix) C9 (External O2 Sensor Active) C11 (I/O Port Active) HDCOL (Color...

Every once in a while, my VR3 would lose its lunch, usually or perhaps always when the battery died in storage. To unlock its functions I would have to re-enter all the PINs. There is no way to display them, so if they're lost and the computer forgets them, you now have an air/nitrox computer...

For a trimix dive computer, this is a good deal, particularly for someone starting out. I have one I keep in case one my my Shearwaters dies. Worth pointing out a few things: - Unless I've missed something (I have an earlier version), it only does VPM. VPM kept me from getting bent for some...

While I never actually wound up ordering anything from you, thanks for being a resource to the community. I completely understand why you're done, thiough.

I won't vouch for your numbers, but in my opinion you are thinking about it the right way. With a good filter stack, the catalyst (Hopcalite or similar) should remove nearly all CO, turning it into CO2. CO2 has its own problems but they're not as bad as CO's problems. Nearly all my diving is...

I have tossed a few stages (mostly 2nds) that weren't worth fixing or for which I couldn't get parts. The now-spare firsts work great as tire fillers. But generally I agree with you. Most of my regs were bought used. The ones in service all work perfectly.

So as I understand what Simon wrote in that post, he is saying that dissolved O2 alone cannot fully replace Hb transport. I don't think what Dr. Sotis said or what I wrote contradicts that. If Hb transport is impaired enough to make a deficit in the amount of O2 required by the tissues, there...

Citation, please. Always happy to learn from Simon and missed whatever he had to say on the topic. However, I'd think that there are situations where the hemoglobin has not all been bound to CO where her point is valid outside the accepted norms of O2 toxicity. Perhaps not, though.

I didn't mean to imply greater or lesser solubility, since I don't recall it being discussed and didn't look it up, so I plain don't know. I don't think it's hidden in what I wrote, which was mean to describe it. Perhaps I could have done that better (shrug). Your last sentence is precisely...

At a BTS seminar several years ago, Dr. Claudia Sotis* pointed out that O2 dissolves in blood plasma, just like inert gases do. There are depth/PPO2 combinations at which the dissolved O2 can deliver enough to the cells to offset the deficit caused by CO having bound to hemoglobin. She showed...

The Petrel would be a fine primary computer. It'll do just fine in a secondary/backup role as well.

You do NOT want to tear things "down there." The ensuing surgery really sucks. And you'll be back on opiates because the pain is really bad. And then, you'll be constipated *again*. Do whatever you have to do to avoid that. Anything at all.

Some are time-release and not subdivisible. So Pete should check with his doc before changing dosage and frequency unless he already knows what's what. Constipation is a well-known side effect of opiod painkillers. About all one can do is take laxatives, use an enema, or abstain until you...

I was never taught this, simply because power inflaters weren't around when I learned to dive. But the first time it happened to me, I just disconnected it. Pretty obvious, I would have thought. I mouth inflated the rest of the trip. Since I'd learned to dive that way it didn't seem like a...

Yeah. That's exactly why my compressor and blending stuff has all paid for itself several times over. The people I was diving with were easily paying 4x what it was costing me to mix at home. Trimix was the big savings but nitrox and O2 fills factored in nicely as well. The profit margins...

Yup. That, too. But the shop that mixed my gas before I did it myself blew them down every time, and they had a very nice 2-stage booster (an AG15/30 if memory serves).

Some shops always start from scratch, for a couple of reasons. (a) It's simpler. (b) They don't know who filled it last, necessarily, so they know the fill is *their* fill and believe they are less exposed to liability. I don't, because (a) it's noisier, (b) it doesn't really complicate...

Time, as I said, also works. So does transport by car or truck. But the essential point is that you do what you have to do to figure out what's happening when the mix is not what's expected. The analysis should closely match the intended blend. When it doesn't, you can wait, you can roll...

Respectfully, every 3 months on the old filters would be much better than twice a year. Monthly, even, if you're pumping a lot of gas. I applaud the use of an attached CO monitor.