Double-Posting: Dumbing Down (to my level) Gritty Mix Manufacture

ariel7576(7b)March 31, 2014

I posted the following in the Soils forum, but I suspect Al might see it more readily in here. Sorry for the double-post.

I generally like (perhaps undeservedly) to think of myself as a relatively intelligent person. Nonetheless, understanding the process of creating the gritty mix has been a challenge. I've read through the entire latest container soil & water retention thread and several of its cousins. Questions remain, so I'm hoping Al or one of his devotees will help me out.
My problem seems to centre on the screening. Each of the ingredients must be screened twice, correct, so that there's no "dust" and each particle is between â and 1 / 4 of an inch?

For example, the pine bark: Initially, screen it so that there's no "fluff" that is smaller than â of an inch. Then, of what does not fall through the screen, re-screen to remove anything larger than 1/ 4 of an inch.

Then, for the Gran-I-Grit, do you rinse it first, and then screen (that seems like it would be more difficult)? Or, if you get #2-size, is screening required? Again, the size of the particles should be between â and 1 / 4 of an inch, so you'd want two screenings.

Likewise for the Turface?

It has likely been addressed several times, but there are new members joining all the time, and people make have thought of something else since the last time it was asked, but, what do you do with all of the stuff you discard?

Thanks in advance for helping.
(Also, sorry, but the one-fourth symbol doesn't display correctly for me, so I added a couple of spaces.)

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greenman28 NorCal 7b/8a

Hello, yes you have it correct :-)
Two screenings are required for the ingredients. With the granite grit, screen first and then rinse (right again). Turface and quartzite (my granite substitute), I toss over a piece of metal insect/window screen, and I keep everything else (since I've seldom found a piece of turface or quartz grit that was too large). The bark is the most tedious - I pass the bark over a 1/4 inch screen into a pond-basket (with perforated sides and bottom. This allows me to then shake and rinse out the fine bark dust.


    Bookmark   March 31, 2014 at 7:06PM
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Thank you.
I suppose I can go to Lowes or HD and tell them I want a bit of screen with the appropriate-size holes, or is it something I need to special order?

    Bookmark   March 31, 2014 at 8:05PM
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greenman28 NorCal 7b/8a

Metal window/door screen ought to be easy to find.
And for the 1/4 inch screen, a piece of 1/4 inch "hardware cloth" (which is metal) should be available at just about any hardware store.


    Bookmark   March 31, 2014 at 9:30PM
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Perfect! Thank you.

    Bookmark   March 31, 2014 at 10:52PM
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Thanks for asking these questions. As i was confused too.
I have been reading and reading to try to understand how to screen this stuff. It makes sense now.


    Bookmark   April 1, 2014 at 3:49PM
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