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Sand mesh/mm calculation

7K views 5 replies 4 participants last post by  Rex Grigg 
#1 ·
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/Fertilizer/gravel-article.html

Dan
 
#3 ·
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
 
#5 ·
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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