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Reusing a scrubber?

Discussion in 'Rebreather Diving' started by kensuf, Sep 24, 2019.

  1. happy-diver

    happy-diver Skindiver Just feelin it ScubaBoard Sponsor

    # of Dives: 2,500 - 4,999
    Location: same ocean as you

    Now, by popular demand, here's a reprint of my famous


    "The next time you go to the market, remember that half of the people that you meet are of below average intelligence".

    WARNING! Rebreather Diving is a dangerous sport. It weeds out the weak by KILLING them. Can I make it any clearer than that? SO: Remember, Rebreather-Diving AT ALL is dangerous enough. Making up EXPERIMENTAL rigs from parts gathered from here and there is about as iffy as it gets. DON'T try this if you don't know what you are doing. If you get killed following my methods, then shame on you! Don't let your family come crying to me as to how I facilitated YOUR death. The bottom line is that if you could not do this sort of conversion WITHOUT READING ANY INSTRUCTIONS AT ALL you are not ready to do it by following my methods. Hey! Be careful out there, huh? If you want to persist in twisting the tail of the Dragon, Go read my Philosophy Page now to see if you have you head screwed on in the right way to accept these risks.
    FreeFlyFreak and Dark Wolf like this.
  2. lermontov

    lermontov Manta Ray

    # of Dives: 500 - 999
    Location: christchurch
    I like the philosophy page
    Dark Wolf likes this.
  3. rjack321

    rjack321 Captain

    # of Dives: 1,000 - 2,499
    Location: Port Orchard, WA
    Dark Wolf and fsardone like this.
  4. Gareth J

    Gareth J Manta Ray

    # of Dives: 1,000 - 2,499
    Location: UK
    I am some what surprised and concerned that it appears that the practice of reusing scrubber material is still happening. By that I mean repacking a scrubber with previously used material.

    When I first started diving a CCR over 15 years ago, we where told NEVER reuse scrubber material. I started during the wild west period, or just towards the end of it. We were still learning, and there was a high attrition rate in the CCR community. I thought these hard won lessons had been learnt.

    We should have learnt by now,
    Change your sensors regularly (on time), or as soon as they start to play up.
    Don't repack scrubbers
    Don't over dive your scrubber.
    Prebreath the unit.
    Be diligent in assembly and test prior to diving.
    Pay attention to your PO2 (something I still struggle with).

    CCR diving is not cheap. But don't skimp on sensors and lime, they are the cheapest part of diving.
    FreeFlyFreak and Peter69_56 like this.
  5. Jeremy Williams

    Jeremy Williams Nassau Grouper

    These things happen. Old lessons are forgotten and rediscovered. Improvements to scrubber design and ever more suitable material (i.e. Sofnolime 797) make the entire process more and more tolerant of error even in the face of practices that might have been quickly fatal 20 years ago. And for the record, I agree that re-packing a scrubber with partially used absorbent is not a good plan.

    As a tangent, I was reminded of an article I read years ago about scurvy... If you don't mind a long read, you may enjoy it. The British had (and lost) the cure for scurvy multiple times. Advances in technology allowed them to unwittingly replace the effective cure with an ineffective one. A good practice was replaced with a poor practice without immediate harm. It wasn't until pressed that the ineffective cure fell flat and caused the death of so many. For the simple lack of common ascorbic acid...

    Scott And Scurvy (Idle Words)
    cathal and jale like this.
  6. jale

    jale Barracuda

    Really good and instructive reading. Thanks.
    I just hope this confusion "reuse canister-reuse lime" won't become a "lemon-lime" confusion as explained in this story.
    This small word "lime" gives troubles whatever its meaning :wink:
    stuartv likes this.
  7. Jeremy Williams

    Jeremy Williams Nassau Grouper

    You see how it stirred my memory!
  8. Reku

    Reku Solo Diver

    # of Dives: 5,000 - ∞
    Location: Great Lakes + Northern Florida + Marsh Harbor
    Oh ..... If He's emptying the scrubber into a bag and repacking...that's extremely dangerous...

    I may of misread the post. It never crossed my mind that someone would empty and store partially used material and then repack that material at a later date. Sorry if I was mistaken. I never expected that. Maybe my brain skipped over it? That's horrifying. That messes the entire dynamic of the scrubber heat front that moves through the scrubber basket.

    Not good.
  9. broncobowsher

    broncobowsher Solo Diver

    It doesn't look like the original poster who said they were pouring out the sorb and pouring it back in later. It looks to be a later poster that said that is what they were doing. So give credit to the OP is they may have saved another's butt with this thread.
    cathal likes this.
  10. stuartv

    stuartv Seeking the Light

    # of Dives: 200 - 499
    Location: Manassas, VA
    I just wish y’all would tighten up a bit on your terminology.

    I think some people have posted about “reusing scrubber” when they really meant reusing sorb. To me, scrubber is a hard part of my ccr that gets packed full of sorb.

    Imprecise terminology can be really confusing to newbs (like me) who are just here to read and learn.
    FreeFlyFreak and Dark Wolf like this.

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