RE: [compost_tea] dirty filters

From: ray gore <xrg22000_at_yahoo.com>
Date: Wed, 24 Sep 2003 21:32:02 -0700 (PDT)

haha,maybe you should put a disclaimer on the bottom
of your msgs Bob? Everyone, just to be safe. RayG
--- Mike Bosko <mjbosko_at_jmtsystems.com> wrote:
> Disclaimer: I'm not selling the filterless sprayer
> I mentioned - I'm
> building it for my own use.
> -----Original Message-----
> From: Mike Bosko [mailto:mjbosko_at_jmtsystems.com]
> Sent: Wednesday, September 24, 2003 9:19 PM
> To: compost_tea_at_yahoogroups.com
> Subject: RE: [compost_tea] dirty filters
>
>
> This has always been my thought as well. Whats a
> filter do for you, in
> terms of AACT, if after the first 10 minutes it,
> well, does its job? Doing
> its job means to block particles. Blocking particles
> means to block flow -
> and thus reducing the flow size of the filter (mesh,
> micron, whatever).
> After a short amount of time, your mesh size (or
> whatever, I'm not going
> there) is made smaller anyway. Its going to end up
> blocking the good stuff
> in a very short time - no?
>
> I too am working to design a filterless spray
> system - And many thanks to
> Bob, for his offlist engineering ideas to help me
> get closer - great ideas.
> I'm excited to see what you have to bring to the
> table next year. I know,
> we can use a standardized test to test it against
> the other sprayers out
> ther..... oh, nevermind. =)
>
> Mike
>
> -----Original Message-----
> From: Robert Norsen [mailto:bnbrew_at_yahoo.com]
> Sent: Wednesday, September 24, 2003 8:44 PM
> To: compost_tea_at_yahoogroups.com
> Subject: Re: [compost_tea] dirty filters
>
>
> Now that you have massaged the details of
> filters until they are worn
> thin consider this: As you filter ACT + crap thru
> the filter, what won't go
> thru hangs up on the filter, right? Like a beaver
> dam only dam small. So
> now the holes that were some size are half or more
> closed with what the
> filter held back. A 100 micron filter is anywhere
> from 100 to 0 microns.
> Water molecules still go thru. But some or many of
> the microbes that were
> going to go thru a clean filter are blocked by a
> dirty filter. Are you
> gaining a lot of useful brewer design based on a
> precise filter size? A
> filter that allows bacteria but stops fungi? Not
> good. A filter that
> passes fingi but stops protozoa? Not good. A
> filter that passes protozoa
> but stops ............ Earthworm eggs? What part of
> ACT is not useful?
>
> Or is it better strategy to let larger particles
> stay in the ACT and
> design a system that allows the course particles to
> go to the field or
> garden where nature can welcome them ? No filter.
> No plugs. Tthat is the
> system we will offer for the spring of 2004.
>
> Bob of Bob's Brewers
>
>
> Kirk Leonard <kirk_at_oregonatural.com> wrote:
> I think this horse is rode and I'm glad I'm
> not the only one who was
> confused. I'm still prone to some confusion
> but understand much
> better than
> the first time we discussed this.
>
> "Mesh is an inexact measure" my new filter
> sales guy says today. Ya.
> Finally
> got that.
>
> "Microns are an absolute number." Exactly.
>
> "Mesh and microns are inversely related." Got
> that finally, too.
>
> The size of openings in a filter is what you
> want to know most, hmm?
> Mesh
> values, and mesh tables, vary by manufacturer
> and material. Together
> with
> the opening size and wire or fiber diameter,
> you can calculate a mesh
> using
> twpinc.com's calculator if you want to. In
> any event, you have to
> know two
> of these things to figure out the third.
>
> If you're looking at mesh, you need to know
> the diameter of the
> material to
> figure if it's actually the opening size you
> think it is. If your
> supplier
> gave you a mesh table, presumably you can
> ignore this problem. If you
> have
> a good micrometer or mm ruler and a good eye
> you could measure it,
> since we
> are talking visible range here (unlike most
> compost tea contents).
>
> The variance among same mesh values and actual
> opening sizes is
> explained by
> the diameter of the material, hmm? Tables I've
> seen tell me the
> variance in
> diameters can be a good bit (even within
> tables, it seems, definitely
> between).
>
> If you know a mesh value and opening size, you
> can even get what
> diameter
> material it's made of, too. Hey, we can get
> fancy here... Dennis' is
> definitely a chunky filter, I'd guess.
>
> I'm still curious what you paid $67 for, guy.
> Sounds like it might be
> stainless or monofilament? Formed? Framed?
> Sorry, though, don't
> think
> you're gonna get very many 6.35mm X 1.5875mm
> critters through a 1.2mm
> filter
> (which is probably fine, anyway... all we need
> to do is lodge them
> live,
> whatever size, and most in tea are smaller,
> right?). Maybe they could
> slip-slide through sideways occasionally,
> depends how thick or
> slithery they
> are, I suppose...
>
> I gotta say how ironic it is to be struggling
> with openings in microns
> and
> meshes in inches. I mean, I can really work
> easily with a measure of
> .000039 inches... huh? "Mesh" seems to be
> some kind of industrial
> "standard" that never became one, other than
> the rule of thumb that
> says
> lower mesh numbers mean bigger openings, which
> is definitely useful
> but
> occasionally confusing, though less so now.:)
> That might be as good
> a
> story as 4 foot 8 inch railroad tracks.
> Anybody know the mesh story?
>
> Thanks folks. I will never look at baby
> powder quite the same way
> again.
>
> -- Kirk
>
>
>
>
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Received on Thu Sep 25 2003 - 01:13:27 EDT

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