Sand mesh/mm calculation - The Planted Tank Forum
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Old 08-02-2004, 04:58 PM Thread Starter
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Sand mesh/mm calculation

hey all,

I found this while doing a Yahoo Search. I called a local Sand and Gravel supply company and the guy told me they carried sand in mesh sizes of 8, 16, 20, 30, and 70. This link then told me what it calculates to in the form of millimeters (mm).

http://www.thekrib.com/Plants/Fertil...l-article.html

Dan
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Old 08-02-2004, 05:59 PM
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The guy and the sand and gravel pit should be able to tell you the grain size in mm and inches. Its written on the sieve next to the sieve number. Typically you don't use the sieve number until you get down to the number 4.
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Old 08-02-2004, 06:11 PM
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Ok so I'm board at work
According to the USCS (Unified Soil Classification System)

3"_______ 76.20 mm
2"_______ 50.80 mm
1 1/2"____ 37.50 mm
1"_______ 25.00 mm
3/4"_____ 19.00 mm
1/2"_____ 12.70 mm
3/8"_____ 9.51 mm
1/4"_____ 6.35 mm
No 4______ 4.76 mm
No 10_____ 2.00 mm
No 20_____ 0.84 mm
No 40_____ 0.42 mm
No 80_____ 0.18 mm
No 100____ 0.15 mm
No 200_____ 0.07 mm

Gravel: Passing 3" but retained on the No. 4 sieve
Coarse Sand: Passing No. 4 but retained on No. 10
Medium Sand: passing No. 10 but retained on No. 40
Fine Sand: Passing No 40 but retained on No. 200
Silt particals are 0.074 to 0.005mm
Clays are smaller than 0.005mm
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Old 08-02-2004, 08:24 PM Thread Starter
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Ok, put a gun to my head now. I think Ill just stick with onyx or tahitian moon sand if I decide to use any sand at all.
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Old 08-03-2004, 03:11 PM
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Were do you guy's buy onyx or tahitian moon sand? What color do they have? Does it change ph, gh or kh if you put it in the tank? Can i mix it with flourite gravel?

I know i have too many questions but i am planning to set-up my 20 high this thursday & want to put sand for a change.

Thanks!!

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Old 08-03-2004, 04:59 PM
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Onyx sand http://seachem.com/products/product_...yx%20Sand.html

Tahitian Moon Sand is inert and black. Onyx is a light grey. I have one tank with Onyx and will soon be switching to either Flourite or Eco-Complete.
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