Fathom Gemini WOB on partially used scrubber

[JCM@Atlam]

Hazard a guess, but I bet if you only use one on the top of the scrubber you're inhaling from, most of your problem goes away. This isn't to rule out the guesses of the other posters, but more than one of those scrims is excessive. Was this what was taught in your course?

Also, your Gemini does not hold 4.4kg of scrubber.

I shall try what you suggest.

So it's 2.2kg split between the two scrubbers?

 

[JCM@Atlam]

Sure. I can always bring this to a different thread since it's a bit off topic from OP's question but the unit was made by Martin at TecMe. I gave him a little input about how I wanted the exhale side.

The exhale side has a lid that prevents accumulation of spit / lung butter from entering the exhale scrubber. It won't help with a full-on flood but it stops a significant amount of water accumulation from things like loose lips/spit/drool from entering the exhale scrubber.

I had him design a newer lid where I put 4-5 chamois (absorbent cloth/sponges) to soak up some of the drool. It works quite well on longer dives.

This is a video without the chamois in the lid:
Video of lid with chamois installed:

Any chance he can make one to retrofit to the Gemini?

 

[Mobulai]

Any chance he can make one to retrofit to the Gemini?

Most probably yeah, just reach out to him (email in website)

 

[grantctobin]

I shall try what you suggest.

So it's 2.2kg split between the two scrubbers?

Yes.

And also yes, you have a lot of troubleshooting worth doing before trying to modify the unit via TecMe. I would guess that removing the scrim from your exhale scrubber will drastically change your perception of how much water there is in the unit.

 

[rjack321]

After 2.5 hours, quite a bit. After 90 mins little/none

Why are you trying to reuse soaking wet sorb with 2.5 hours on it?!? THROW IT OUT!

 

[JCM@Atlam]

Why are you trying to reuse soaking wet sorb with 2.5 hours on it?!? THROW IT OUT!

Where did I say I was trying to do that?

 

[rjack321]

Where did I say I was trying to do that?

Because you're talking nonsense about various ideas to dry out a wet canister.

Here

Is it worth removing the offending scrubber after a dive, and leaving it to stand in my apartment for a day or two to let it dry? Putting it in a sealed container with silica gel, in an attempt to draw out the moisture? Tipping out the lime into a tray and letting it dry in the window for an hour or two before repacking it in the canister?

and again here

Sorry, I misread, you would want it dry. Makes sense.

 

[JCM@Atlam]

Because you're talking nonsense about various ideas to dry out a wet canister.

Here

and again here

I specifically said after 90 mins, 50% of the intended duration. Get your facts right before you accuse others of nonsense

'If I do, say, a 90 min dive on two fresh scrubbers, WOB is always great. Even at the end of a normal dive, it is still breathing beautifully. If I then leave the unit untouched for 24 hours and then do a pre breathe on it, the WOB often becomes noticeably worse to an unacceptable level'

 

[JCM@Atlam]

Yes.

And also yes, you have a lot of troubleshooting worth doing before trying to modify the unit via TecMe. I would guess that removing the scrim from your exhale scrubber will drastically change your perception of how much water there is in the unit.

I've removed two, the ones from the bottom of each scrubber. I can't see how I can remove just one of the others, given the scrubbers are rotated. Let's see how it goes...

 

[rjack321]

I specifically said after 90 mins, 50% of the intended duration. Get your facts right before you accuse others of nonsense

'If I do, say, a 90 min dive on two fresh scrubbers, WOB is always great. Even at the end of a normal dive, it is still breathing beautifully. If I then leave the unit untouched for 24 hours and then do a pre breathe on it, the WOB often becomes noticeably worse to an unacceptable level'

Yes you also said it's not wet after 90 mins

After 2.5 hours, quite a bit. After 90 mins little/none

And they went on talking about how its a 4.4kg scrubber (it isnt) and ideas about leaving it out in the sun.

1) Stop any thought of drying out sorb ever. It's supposed to have moisture in it right out of the tub, roughly 5% of that 40kg tub is actually water. If the exhale canister has water dripping out of it throw it out regardless of the time on it.

2) Get rid of all the scrims that arent actually needed. You only need 1 on the inhale side of the inhale canister.

3) Find a new instructor.