Sand and Gravel Filtration Media

Filtration Media

Sand & Gravel

FILTRATION MEDIA INDEX | DOWNLOAD PDF

SWT Sand and Gravel are manufactured with precise effective size ranges and the lowest uniformity coefficients in the industry.

SWT Silica Sand is graded specifically for use in water and waste water filtration processes. Our sand can be used in municipal, industrial, or residential applications. The low acid solubility and high silica content of our filter sand ensures durable and long lasting filter media performance.

SWT Gravel is manufactured to be uniform in size which promotes excellent flow and even distribution in support beds. Our gravel is low in soluble impurities and maintains its quality as a support bed for the filter media.

Meets or exceeds all ASI, AWWA, or ASME standards and protocols. UL Certified to NSF/ANSI Standards 61 & 372.

FILTER SAND PROPERTIES
Color	Light brown
Form	Sub-angular/sub-round
Bulk Density	~100 lbs. per cubic foot
Hardness	6.0 to 7.0 (Mohs scale)
Effective Size Range	0.2-0.3mm to 2.0-3.0mm
Uniformity Coefficient	1.3 to 1.7 maximum
Acid Solubility	<1.0%
Specific Gravity	>2.6
Silicon Dioxide Content	>85%
Loss on Ignition	<2.0%
Source of Material	USA

SUPPORT GRAVEL PROPERTIES
Color	Assorted
Form	Uncrushed, smooth surface
Bulk Density	~100 lbs. per cubic foot
Hardness	7.0 to 8.0 (Mohs scale)
Effective Size Range	1/8” x 1/16” to 2.5” x 1.5”
Porosity	38% - 45%
Acid Solubility	<1.0%
Specific Gravity	>2.6
Deleterious Material	< 1.0%
Thin, Flat & Elongated	<2.0%
Source of Material	USA

FILTER SAND
Product Effective Size (mm)		2.00-3.00	1.65-2.00	1.20-1.60	0.80-1.20	0.65-0.75	0.60-0.65	0.45-0.55	0.35-0.45	0.20-0.30
US Mesh	mm	Percent Passing (%)
4	4.75	99
5	4.00	89	99
6	3.35	57	94	99
7	2.80	27	78	96
8	2.36	10	57	90
10	2.00	3	29	73	99
12	1.70	1	6	50	98	99
14	1.40		1	15	77	97
16	1.18			3	51	87	99	99
18	1.00			1	20	64	88	94
20	0.850				5	41	65	82	98
25	0.710				1	11	32	58	84
30	0.600					3	7	33	59	98
35	0.500					1	2	10	28	93
40	0.425						1	2	5	72
45	0.355							1	2	42
50	0.300									24
60	0.250									10
70	0.212									5
80	0.180									2

SUPPORT GRAVEL
Product Size (inches)			2½ x 1½	½ x 3/4	3/4 x 1/2	5/8 x 3/8	1/2 x 1/4	3/8 x 3/16	1/4 x 1/8	3/16 x 3/32	1/8 x 1/16
US Mesh	inches	mm	Percent Passing (%)
2½"	2.500	63.00	98
2.0"	2.000	50.00	35
1 ½"	1.500	37.50	5	98
1.0"	1.000	25.00	1	40
7/8"	0.875	22.40		18
3/4"	0.750	19.00		4	97
5/8"	0.625	16.00			48	99
1/2"	0.500	12.50			3	77	98
3/8"	0.375	9.50				3	41	98
1/4"	0.250	6.30				1	4	30	96
4	0.187	4.75						4	66	98
5	0.157	4.00							35	84
6	0.132	3.35							11	45	97
1/8"	0.125	3.18							5	14	94
7	0.111	2.80							1	3	80
8	0.094	2.36								1	60
10	0.079	2.00									30
12	0.066	1.70									6
14	0.056	1.40									1

View SWT Filtration Media Guide

This information has been gathered from standard materials and or test data that is believed to be accurate and reliable. Nothing herein shall be determined to be a warranty or representation expressed or implied with respect to the use of such information or the use of the goods described for any particular purpose alone or in combination with other goods or processes, or that their use does not conflict with existing patent rights. No license is granted to practice any patented invention. It is solely for your consideration, investigation and verification.

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