Question Ultrasonic Cleaners vs HCL acid?

[Pearlman]

If you removed the diaphragm on the 19 and put it back in, you need to service that one before using it again. The SP seats for the second stage are easy to replace (stupid expensive for what it is but still easy to keep a few around and change as needed.) I don’t service my own stuff until it needs it and there is no schedule that makes sense that I’ve found.

Yeah I purchased all the service kits when I left the training class and I’m in a hurry now to get the servicing done because I could not plan a spontaneous dive trip vacation this year at all - because I procrastinated about completing the “Regulator Saavy” book ever since I took the hands-on class. Now I intend to do a few days of check diving with my newly serviced gear next month, a long-drive away from here on the coast before making my next International big-budget trip. That’s the plan.

 

[Mobulai]

IP was good. I even opened them up and rebuild and checked them in a live classroom session without replacing with new parts (an mk19evo, mk25evo,s600 and a c370). Only the Apeks Xtx50 has been left untouched but I plan to do it at a later date without the formal Apeks training class by watching YouTube videos. I even got the special lever height adjustment tool for it.

But now that tear down and rebuild means the seat imprint may be just finely misaligned (at least one of my 2nd stage has two mostly overlapping circles on the soft seat just slightly off by a hairs breath (a source of potential leak?) . In any case I don’t want to just leave them unserviced for 3-4 years and keep diving. Some of the high current dive sites I’ve been to really scare me just thinking about equipment failures when fighting currents. All said I also needed a new tinkering hobby so it’s all fine and worth the investment in time as well as in all the speciality tools I got for servicing.

I’d probably rebuild 2nd stages more often than 1st, as long as IP is holding up, since they get more deposits and ingress into them (also lp seat indents)

If you’re having intersecting imprints on the seat that’s a big sign to replace it asap

For the 1st maybe the din/yoke retainer should be done regularly anyways even if IP is good — these threads are very exposed
So a partial rebuild without having to worry about intersections on the HP seat or anything of sorts (the mk25 seat is rigid so not an issue— haven’t worked on my 19 or an xtx yet so can’t tell)
Edit: I see that lex just mentioned the 19 now, and that they need change as well

Of course doing a full rebuild if you gotten started partially

 

[Pearlman]

I’d probably rebuild 2nd stages more often than 1st, as long as IP is holding up, …

For the 1st maybe the din/yoke retainer should be done regularly anyways even if IP is good — these threads are very exposed
So a partial rebuild without having to worry about intersections on the HP seat or anything of sorts …

This is good advice because I remember trying to unscrew my DIN regs the wrong way from the tank valves, by mistake after a few dives - in a way that could have torqued the retainer loose… so in addition to IP checks and inspecting O-rings before a dive trip, add an additional step to correctly torque the retainers to specs…