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OfflineR34P3R
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Registered: 12/21/16
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A filter is a filter?
    #23975242 - 01/02/17 07:24 AM (7 years, 28 days ago)

This is more of a sanity check than a statement. I am using the following documents for reference  points:
Particle Size
MERV 52.2

I am the type of person that likes to understand why something works vs just asking what works. When I go through the filter threads they seem to come down to personal preference backed up by anecdotal evidence. So, I looked around a little more and found that 1.) Tyvek and Micropore are, in practical application, the same. 2.) There is a reason why one swears by something while another swears against.

To filter Mold and Mold spores (3-30 microns) with >90% efficiency you need pores of 1.60 - 2.20 microns
To filter Bacteria (0.3-60 microns) with >90% efficiency you need pores of 3 - 10 microns

As best I can tell Micropore tape is manufactured with a 2 - 20 micron range and Tyvek uses a 2 - 15 micron range. Why polyfill works baffles me a bit. The pore size is purely dependent on how tight you pack it. My best guess is it works well because it is super sticky and traps the particles easily as they bump into the fibers.

This puts us at why some people swear by or curse each. If you get an end product that was manufactured closer to the 2 micron end your experience will be a daisy. However, the inverse is possible as well.

This brings me to the 'A filter is a filter' point. I can see no practical  filtering difference to use one over the other. Does this sound right?


Edited by R34P3R (01/02/17 07:46 AM)


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Invisibleblindingleaf
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Registered: 07/19/13
Posts: 22,008
Loc: sub-surface unseen
Trusted Cultivator
Re: A filter is a filter? [Re: R34P3R]
    #23975290 - 01/02/17 07:48 AM (7 years, 28 days ago)

Quote:

I can see no practical  filtering difference to use one over the other. Does this sound right?




Quote:

When I go through the filter threads they seem to come down to personal preference backed up by anecdotal evidence




:whathesaid:


--------------------
A few thoughts on cultivation
MICROBIAL HUSBANDRY!!!!

The whole is greater than the sum of its parts


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OfflineChk
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Re: A filter is a filter? [Re: R34P3R]
    #23975320 - 01/02/17 08:09 AM (7 years, 28 days ago)

Tyvek and micropore tapes don't age well,
that alone could be a reason not to use them (depending how much you grow ofc)

SFD's are often rated at something like 0.3 microns, IMO if you look at your numbers(spore and bacteria size) it makes more sense to use that than anything else.


--------------------


Edited by Chk (01/02/17 08:09 AM)


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OfflineR34P3R
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Re: A filter is a filter? [Re: Chk]
    #23975337 - 01/02/17 08:20 AM (7 years, 28 days ago)

Quote:

Chk said:
Tyvek and micropore tapes don't age well,
that alone could be a reason not to use them (depending how much you grow ofc)

SFD's are often rated at something like 0.3 microns, IMO if you look at your numbers(spore and bacteria size) it makes more sense to use that than anything else.




I completely concur. I do not think you will get much safer than a synthetic filter and an injection port. Most people grow on the cheap and these upgrades throw cheap and simple out the window. Relatively speaking of course  :wink:


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