[PSUBS-MAILIST] CO2

Wed Jun 4 08:57:16 EDT 2025

Hi Rick,

I don't have any data on how much opening the container affects the
absorbent, but can say that I've never noticed any effect. If you get a big
tub of the stuff, you'll be taking the cap on and off a number of times and
there does not seem to be any problem at all with that. Just don't leave it
uncorked for hours or days!

Best,
Alec

On Tue, Jun 3, 2025 at 3:22 PM Rick Patton via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hi Alec
>
> Thanks for the data and the place to buy it. Once you open the 5 gallon
> bucket for the first time and put the lid back on, does the top layer start
> to activate or can you open the lid a month or two later and it hasn't
> skimmed over and start to flash?
>
> Rick
>
> On Mon, Jun 2, 2025 at 5:10 PM Alec Smyth via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> Hi Hugh,
>>
>> Congrats! I'm really looking forward to your boat hitting the water.
>>
>> 1) The Sofnolime will give you 4 person-hours per pound, so 2 people for
>> 3 days requires 36 pounds.
>> 2) There isn't a standard size. Most of us go small because our dives are
>> relatively short and we don't like throwing out barely-used absorbent. The
>> rest of the absorvent supply is carried in small containers, ideally ones
>> that match the size of your scrubbers.
>> 3) For about 2-3 years now, I've been using this veterinary soda lime:
>> https://jorvet.com/product/jorvet-soda-lime-5-gallon/  It costs far less
>> than the "human" absorbent, but the chemistry is just the regular old
>> soda-lime that's been used for a century. I read up on this a bit and
>> learned that human CO2 absorbents have been adapted in recent years to deal
>> with anesthesia that delivered through breathing gases during surgery. It's
>> color-indicating and the same mesh size as what I used to use before, so no
>> changes were needed for the scrubbers.
>>
>> Best,
>> Alec
>>
>> On Mon, Jun 2, 2025 at 9:25 PM Alan James via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>>> That's great news Hugh.
>>> All the best with the testing.
>>> I bought my sofa lime from Global Dive years ago. Presume they are still
>>> selling it.
>>> Alan
>>>
>>> Yahoo Mail: Search, organise, conquer
>>> <https://mail.onelink.me/107872968?pid=nativeplacement&c=US_Acquisition_YMktg_315_SearchOrgConquer_EmailSignature&af_sub1=Acquisition&af_sub2=US_YMktg&af_sub3=&af_sub4=100002039&af_sub5=C01_Email_Static_&af_ios_store_cpp=0c38e4b0-a27e-40f9-a211-f4e2de32ab91&af_android_url=https://play.google.com/store/apps/details?id=com.yahoo.mobile.client.android.mail&listing=search_organize_conquer>
>>>
>>> On Tue, 3 Jun 2025 at 10:57 am, via Personal_Submersibles
>>> <personal_submersibles at psubs.org> wrote:
>>> I am finally getting near to a pool test after 15 years.  Weeks now not
>>> months.
>>> I have been plagued with CANBUS issues and now trying to get an HMI
>>> interface working for all the sensors, batteries, etc.
>>> Just a couple of questions for the practical people.
>>>
>>> 1. What is the accepted 3 day quantity of sofnolime for 2 people.
>>> 2. What size is recommended for the scrubbers?
>>> 3. Where is the bet place to buy it.
>>>
>>> Regards,
>>> Hugh
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: Personal_Submersibles <personal_submersibles-bounces at psubs.org> On
>>> Behalf Of via Personal_Submersibles
>>> Sent: Tuesday, 3 June 2025 4:56 AM
>>> To: personal_submersibles at psubs.org
>>> Subject: Personal_Submersibles Digest, Vol 138, Issue 1
>>>
>>> Send Personal_Submersibles mailing list submissions to
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>>>
>>> Today's Topics:
>>>
>>>   1. Re: CO2 (Jon Wallace via Personal_Submersibles)
>>>   2. Re: CO2 (Rick Patton via Personal_Submersibles)
>>>   3. Re: CO2 (Alan James via Personal_Submersibles)
>>>   4. buffing (Rick Patton via Personal_Submersibles)
>>>   5. Re: buffing (Jon Wallace via Personal_Submersibles)
>>>
>>>
>>> ----------------------------------------------------------------------
>>>
>>> Message: 1
>>> Date: Sat, 31 May 2025 15:11:29 +0000 (UTC)
>>> From: Jon Wallace via Personal_Submersibles
>>>     <personal_submersibles at psubs.org>
>>> To: Personal Submersibles General Discussion
>>>     <personal_submersibles at psubs.org>
>>> Subject: Re: [PSUBS-MAILIST] CO2
>>> Message-ID: <11643796.3454108.1748704289349 at mail.yahoo.com>
>>> Content-Type: text/plain; charset="utf-8"
>>>
>>> Alan will like this, ChatGPT says 0.0523 kg CO2 within 1217 liters
>>> (approx
>>> volume of K350) converts to 21,891 ppm.? That corresponds closely to the
>>> empirical results Steve McQueen got with his K-250.
>>> Jon
>>>
>>>     On Saturday, May 31, 2025 at 12:28:47 AM EDT, Sean T. Stevenson via
>>> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>>
>>>
>>> Per the ABS RULES FOR BUILDING AND CLASSING UNDERWATER VEHICLES, SYSTEMS
>>> AND
>>> HYPERBARIC FACILITIES (2024):
>>>
>>> Section 8
>>> Life Support and Environmental Control Systems
>>>
>>> 8.5
>>> Design Principles
>>>
>>> 8.5.5
>>> Standard Person (2013)
>>>
>>> Carbon Dioxide (CO2) Produced:
>>> 0.0523 (0.115) kg (lbs) per hour at 1 atm.
>>>
>>> Sean
>>>
>>>
>>>
>>> -------- Original Message --------
>>> On 2025-05-30 20:46, irox via Personal_Submersibles wrote:
>>>
>>>
>>> One consideration. CO2 is heavier than Nitrogen, so it may sink to the
>>> floor, if the meter is near the floor the reading may not be
>>> representative
>>> of the actual cabin CO2 level. Also if the meter is somewhere than CO2
>>> can
>>> 'pool' around it reading may be higher.
>>>
>>> ?
>>>
>>> Moving around will also help mix up gases which may help give a more
>>> accurate CO2 reading.
>>>
>>> _______________________________________________
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>>> ------------------------------
>>>
>>> Message: 2
>>> Date: Sat, 31 May 2025 07:42:49 -1000
>>> From: Rick Patton via Personal_Submersibles
>>>     <personal_submersibles at psubs.org>
>>> To: Personal Submersibles General Discussion
>>>     <personal_submersibles at psubs.org>
>>> Subject: Re: [PSUBS-MAILIST] CO2
>>> Message-ID:
>>>     <CAODkcU-b8z_4ycqM0vf=Jo4qAnEeP0OR4fSnCFEVDMLOAmXcXw at mail.gmail.com>
>>> Content-Type: text/plain; charset="utf-8"
>>>
>>> I had the monitor in the middle of the hull so it would give an accurate
>>> reading. I know that Co2 is heavy but what confuses me is the fact that
>>> it
>>> rose so fast when lying down and then started dropping when I sat up?? I
>>> have a fan installed in the back for atmosphere circulation while
>>> submerged
>>> but it is noisier than I would like but really moves the air around but
>>> might end up using a computer fan, just concerned that I will get the
>>> proper
>>> movement of air.
>>>
>>> Rick
>>>
>>> On Sat, May 31, 2025 at 5:01?AM Jon Wallace via Personal_Submersibles <
>>> personal_submersibles at psubs.org> wrote:
>>>
>>> > Rick,
>>> >
>>> > If you haven't already I would install some fans to help circulate the
>>> > air.  I have two 4inch computer fans, one fore, one aft, that work
>>> > pretty good for this purpose and they draw negligible power.
>>> >
>>> > Jon
>>> >
>>> >
>>> >
>>> > On Friday, May 30, 2025 at 11:47:24 PM EDT, irox via
>>> > Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>> >
>>> >
>>> > One consideration. CO2 is heavier than Nitrogen, so it may sink to the
>>> > floor, if the meter is near the floor the reading may not be
>>> > representative of the actual cabin CO2 level. Also if the meter is
>>> > somewhere than CO2 can 'pool' around it reading may be higher.
>>> >
>>> >
>>> >
>>> > Moving around will also help mix up gases which may help give a more
>>> > accurate CO2 reading.
>>> > _______________________________________________
>>> > Personal_Submersibles mailing list
>>> > Personal_Submersibles at psubs.org
>>> > http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>>> > _______________________________________________
>>> > Personal_Submersibles mailing list
>>> > Personal_Submersibles at psubs.org
>>> > http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>>> >
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>>> ------------------------------
>>>
>>> Message: 3
>>> Date: Sat, 31 May 2025 21:12:05 +0000 (UTC)
>>> From: Alan James via Personal_Submersibles
>>>     <personal_submersibles at psubs.org>
>>> To: Personal Submersibles General Discussion
>>>     <personal_submersibles at psubs.org>
>>> Subject: Re: [PSUBS-MAILIST] CO2
>>> Message-ID: <1475430295.3543034.1748725926000 at mail.yahoo.com>
>>> Content-Type: text/plain; charset="utf-8"
>>>
>>> Jon,
>>> I get mixed results with chat GPT.
>>> I have the paid version & was advised by an expert to select the 03
>>> variant
>>> that is a lot slower & more thorough, but requires you to be more
>>> specific
>>> in your requests.
>>> I asked it to design a scrubber for me but the result was pretty
>>> disappointing.
>>> It is very good at calculations.
>>> Some times it comes up with amazing results, other times you need to
>>> correct
>>> it several times.
>>> Alan
>>>
>>> Yahoo Mail: Search, organise, conquer
>>>
>>>   On Sun, 1 Jun 2025 at 1:12 am, Jon Wallace via
>>> Personal_Submersibles<personal_submersibles at psubs.org> wrote:
>>> _______________________________________________
>>> Personal_Submersibles mailing list
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>>> ------------------------------
>>>
>>> Message: 4
>>> Date: Sun, 1 Jun 2025 09:33:15 -1000
>>> From: Rick Patton via Personal_Submersibles
>>>     <personal_submersibles at psubs.org>
>>> To: psubs chat room <personal_submersibles at psubs.org>
>>> Subject: [PSUBS-MAILIST] buffing
>>> Message-ID:
>>>     <CAODkcU8rXbDj_0wnVXb1n41VtczeX2o2Zh4oReE48TYAcrjT6w at mail.gmail.com>
>>> Content-Type: text/plain; charset="utf-8"
>>>
>>> Jon, the Novus compound that I ordered for cleaning up a viewport should
>>> be
>>> here in a couple of days and was wondering if there was a certain type of
>>> buffing pad you used and should I be concerned about the RPM I use?
>>>
>>> Rick
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>>> ------------------------------
>>>
>>> Message: 5
>>> Date: Mon, 2 Jun 2025 16:55:16 +0000 (UTC)
>>> From: Jon Wallace via Personal_Submersibles
>>>     <personal_submersibles at psubs.org>
>>> To: psubs chat room <personal_submersibles at psubs.org>
>>> Subject: Re: [PSUBS-MAILIST] buffing
>>> Message-ID: <321358833.4029036.1748883316841 at mail.yahoo.com>
>>> Content-Type: text/plain; charset="utf-8"
>>>
>>> Rick,?
>>> I don't think the pad actually matters all that much but see link for
>>> pads I
>>> purchased.? Don't mix the compound and pads, use only one compound with
>>> each
>>> pad.? I used the green pad for the coarse polish and yellow pad for the
>>> fine
>>> polish.? Speed also doesn't matter in my opinion, I think I used medium
>>> speed.? Beware of your surroundings however, a motorized buffer with
>>> throw
>>> some of the polish around and it's difficult to get off when it dries.?
>>> Use
>>> a drop cloth or plastic to protect anything in the vicinity that you
>>> don't
>>> want to get polish on.? As well, the polish will get all over your
>>> buffer so
>>> will require some cleanup when you are done.
>>> Amazon.com
>>>
>>> |
>>> |
>>> |  |
>>> Amazon.com
>>>
>>>
>>> |
>>>
>>> |
>>>
>>> |
>>>
>>>
>>>
>>>
>>>     On Sunday, June 1, 2025 at 03:35:02 PM EDT, Rick Patton via
>>> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>>
>>> Jon, the Novus compound?that I ordered for cleaning up a viewport should
>>> be
>>> here in a couple of days and was wondering if there was a certain?type of
>>> buffing pad you used and should I be concerned about the RPM I use??
>>> Rick_______________________________________________
>>> Personal_Submersibles mailing list
>>> Personal_Submersibles at psubs.org
>>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
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>> _______________________________________________
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