[PSUBS-MAILIST] Scrubber size

[David Colombo via Personal_Submersibles]

Alex, thats what I thought.  The filter did come with a fine mesh bag, and
the outside fabric cover I assumed that would be small enough. I need to
find some ss snap clamps to pull the cover down. The fiter did come with
foam donut at both top and bottom. I was going to replace that with a
litter denser foam to help in the compression.

Best Regards,
David Colombo

804 College Ave
Santa Rosa, CA. 95404
(707) 536-1424
www.SeaQuestor.com



On Mon, Dec 14, 2020 at 6:39 AM Alec Smyth via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hi Dave,
>
> From the photos, I think you've picked up the exact same carbon scrubber I
> had in Snoopy. The holes are a bit big for Sofnolime, but you can easily
> add a second layer of much finer mesh stitched to the inside of the
> existing cylinders with fine wire. Use a donut of foam on top of the
> Sofnolime to squash it down, so there isn't a path of low resistance for
> the air to flow over rather than through the Sofnolime as it settles. Also,
> be sure to use a radial blower, not an axial one. As for the volume, it was
> perfect for Snoopy but I was diving with two people, so if you cut it in
> half I think you'll be about right. I don't anticipate you'll get any
> significant heating. The absorbent will get soggy and can drip, so mount it
> with the blower on top to keep that dry.
>
> Best,
> Alec
>
> On Sun, Dec 13, 2020 at 10:14 PM David Colombo via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> Hi Guys, I was following Jon's thread and thought how appropriate.  I am
>> building a scrubber for the VAST sub. The housing I acquired was a carbon
>> filter used in the grow industry.  With an interior screen core for the air
>> to flow thru to the sodasorb core to the outside screen. The volume of this
>> space holds 3.6 lbs of carbon. Not sure if the weight per volume of the
>> sodasorb is exactly the same, but if it is that chamber would produce about
>> 14.4 hours of absorption. I'm am thinking that I am going to cut the unit
>> in half. My thinking is that for a typical day of diving, 14 hrs seem a bit
>> excessive and I would be wasting  a lot of sorb.  With pre packaged,
>> vacuumed bags I can carry what would be required to meet ABS guidelines.
>> One of my concerns though is that with the compactness of the VAST sub with
>> a reduced volume of sorb, would the heat generated be greater than with
>> more sorb, thereby also increasing the humidity buildup.
>> I am hoping to get some experience feedback from other small owners, and
>> what they have used volume wise of the sorb for a typical day of diving.
>> The co2 unit I am using measures humidity as well as co2 ppm.
>> Attached are pictures of the unit ready to have the fan attached.
>> Best Regards,
>> David Colombo
>>
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