2023 Online Catalog - Flipbook - Page 134
4
Garnet
Garnet
Garnet is a high hardness, high density granular filter media. It is
Resins, Media & Chemicals
normally used as the lower (final) filtration layer of a multi-bed
down-flow filtration system. Called Multi-Media or Mixed Media
filtration, the high density small grain size of Garnet solves a major
filtration problem. In a single media granular filter such as a sand
filter, the material will hydraulically classify during backwash
according to granule size, the smallest rinsing to the top. When
water flows downward through the sand, the fine particles at the
top of the bed do most of the straining of the sediment. The solids
form a cake on the surface with filtration typically taking place in
the top few inches. As the cake forms, the filtration becomes finer
and head loss increases exponentially in time.
The ideal situation would be to have the large grains of media
at the top to trap the large solids and a uniformly decreasing
grain size in the direction of fluid flow with the small grains at
the bottom to do the final polishing. The penetration of the solids
through the entire bed allows increased solids storage, longer filter
runs and higher filtration rates.
A properly designed multi-media system will maintain its unique
inverse void gradation and provide superior performance even
after long periods of use in backwash. This stable condition of
large grains above finer ones is achieved by the use of materials
of different sizes and specific gravities. Garnet with its high
specific gravity of 4.0 forms the lower fine grain layer, its 0.3 mm
effective size can filter down to the 10-20 micron range. Filter
sand (e.s. =0.5 mm) and Anthracite (e.s. = 0.9 mm) or Filter-Ag
can form the larger less dense layers.
16
Garnet mineral sand manufactured by
International Garnet Co., Inc. is classified by
Underwriters Laboratories Inc.® in Accordance
with Standard NSF/ANSI/CAN 61
Multi-Media filtration technology is applicable to both water and
waste water treatment. Custom designed filters with varying filter
bed configurations can be designed to meet specific needs. For
the majority of municipal and industrial water supply applications,
a filter bed composed of 55 percent low-density material, 30
percent medium density material, and 15 percent high-density
material is recommended. Garnet sized per requirements, is the
ideal high density material.
#8 Garnet at 150 lb./ft.3 is a good choice for support beds when
using other high density filtration media such as high purity
Corosex II or the new manganese dioxide oxidation media such as
Pyrolox.
Advantages:
• High specific gravity allows unique filter designs.
In combination with other filter media both higher
flow rates, higher loadings and better filtration can
be achieved.
• High hardness reduces attrition and provides for years of
reliable service.
• An excellent support bed for other high density media.
Physical Properties:
Color ................................................................................... Light tan to reddish purple
Type...............................................................................................................................Almandite
Crystal System .............................................................................................................. Cubic
Fracture ........................................................................................................ Sub-conchoidal
Hardness .............................................................................................. 7.5 (Moh’s Scale)
Specific Gravity .................................................................................................................... 4.0
Density............................................................................................ 120 - 150 lbs./cu. ft.
Free Silica ............................................................................................................................ None
Garnet
A high-hardness, high-density filter material used in multi-media filters. Recommended as a support
bed for other materials such as filter sand, anthracite, corosex, etc.
Pallet quantity - 70 bags per pallet
$
GAR8-50
#8, .38 Cubic Ft Bag (50 lb.)
50.75
$
GAR8-50-BOX
#8, .38 Cubic Ft Box (50 lb.)
73.25
GAR12-50
GAR12-50-BOX
#8 - 12, .38 cf Bag (50 lb.)
#8 - 12, .38 cf Box (50 lb.)
$
GAR30/40-50
GAR30/40-50-BOX
#30-40, .36 cf Bag (50 lb.)
#30-40, .36 cf Box (50 lb.)
$
GARNET #8
For more information visit – NelsenCorp.com
GARNET #8 - 12
• Commercial.NelsenCorp.com •
All prices and products subject to change without notice. ©Nelsen Corporation
50.75
73.25
$
GARNET #30 - 40
VestaWater.com
50.75
73.25
$
