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Water Filtration Media

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Specifying Procedure

When Specifying filter media size, it is best to state the Effective Size and Uniformity Coefficient or the Nominal Size required. Only one system should be used. If in doubt, please contact our technical service people who will be pleased to assist in explaining the best method for specifying.

Effective Size (e.s.) - The sieve size opening that will allow 10 percent, by weight, of a representative sample for the filter material to pass.

Uniformity Coefficient (U.C.) - The ratio of the sieve size opening from which 60 percent of the sand, by weight, will pass divided by the sieve size opening from which 10 percent of the sand, by weight, will pass.

Typical Filtration Bed Profiles



Typical Specifications

PRODUCT	3 GRAVEL	4 GRAVEL	5 GRAVEL	6 SAND	6.5 SAND	7C SAND	7M* SAND	W9 SAND
SIEVE SIZE (mm)	TYPICAL GRADING ANALYSIS TEST RESULTS PERCENT PASSING(%)
40.00	.	.	.	.	.	.	.	.
22.40	100	.	.	.	.	.	.	.
19.00	82	.	.	.	.	.	.	.
13.20	16	100	.	.	.	.	.	.
11.20	2	92	.	.	.	.	.	.
9.50	.	60	100	.	.	.	.	.
6.70	.	10	99	.	.	.	.	.
4.75	.	1	46	.	.	.	.	.
3.35	.	.	4	100	.	.	.	.
2.36	.	.	1	87	.	.	.	.
2.00	.	.	.	60	100	.	.	.
1.75	.	.	.	16	99	.	.	.
1.40	.	.	.	1	98	100	100	.
1.21	.	.	.	.	59	99	99	.
1.00	.	.	.	.	14	85	96	.
0.85	.	.	.	.	8	63	84	.
0.71	.	.	.	.	1	27	70	.
0.60	.	.	.	.	.	10	34	100
0.50	.	.	.	.	.	3	8	99
0.43	.	.	.	.	.	1	2	98
0.30	.	.	.	.	.	.	1	81
0.21	.	.	.	.	.	.	.	39
0.15	.	.	.	.	.	.	.	5
0.075	.	.	.	.	.	.	.	1
NOMINAL SIZE (mm)	12-20mm	6-12mm	3-6mm	1.5-3.0	0.8-1.8	0.5-1.3	0.4-1.2	0.1-0.5
LIMITS (%)	8% +/-	8% +/-	8% +/-	8% +/-	.	.	.	.
EFFECTIVE SIZE (mm)	.	.	.	.	0.85-0.95	0.55-0.65	0.45-0.55	.
UNIFORMITY COEFFICIENT	.	.	.	.	<1.5	<1.5	<1.5	.
BULK DENSITY (tonne/m3)	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5
SPECIFIC GRAVITY	2.65	2.65	2.65	2.65	2.65	2.65	2.65	2.65
ACID SOLUBILITY 1:1 HCI Solution	<2%	<2%	<2%	<2%	<2%	<2%	<2%	<2%
* 7M products are made to order only
* If these standard sizes are unsuitable, please contact our technical staff for your specific needs.