Filter Gravel

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Filter Gravel is an extremely effective filter media because of its ability to hold back precipitates containing impurities. Filter sand size, angularity and hardness are the important filter sand characteristics to ensure proper filtering. Products meet or exceed the NSF/ANSI Standard 61 for Drinking Water System Components, as well as AWWA Standard B100-01.

Physical Specifications
Effective Sizes: 1/8″ – 2 1/2″
Uniform Coefficient: 1.2 – 1.7
Specific Gravity: 2.70
Moh’s Hardness: 6
Density: 100 lbs per cubic foot

Sieve Analysis

Filter Gravel – Typical Sieve Analysis – Percent Passing

STANDARD SIEVE	OPENING INCHES	3/4 x 5/8	5/8 x 1/2	1/2 x 3/8	3/8 x 1/4	1/4 x 1/x8	#6 (5-9)	#8 (8-12)	1/8 x 1/16
1"	1	95.1
3/4"	0.75	42.1	95.7
5/8"	0.26	5.2	74.5
1/2"	0.5	2.3	3.5	99.1
3/8"	0.375			52.0	95.1
1/4"	0.25			0.8	20.2	99.2
#4	0.187					38.6
#5	0.157					11.0	99.6
#6	0.132					0.9	81.7
#7	0.11					0.1	38.2	99.8
#8	0.0937						6.3	89.1	99.8
#10	0.0787						0.6	51.0	83.1
#12	0.0661						0.1	19.9	34.9
#14	0.0555							1.8	4.0
#16	0.0469							0.2