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Model Number
: garnet-sleeve

Garnet - Sleeve

$49.00

At 126 pounds per cubic foot garnet is typically used in multi-media filters as the sub-fill or bottom layers of the filter. Although its density requires high backwash rates combining fine mesh garnet with other media such as sand and anthracite significantly increases the filtration capacity of a system.

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Description

Details

At 126 pounds per cubic foot garnet is typically used in multi-media filters as the sub-fill or bottom layers of the filter. Although its density requires high backwash rates combining fine mesh garnet with other media such as sand and anthracite significantly increases the filtration capacity of a system.

Features and Accessories

Product Features

Garnet is a high hardness, high density granular filter media. It is 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 back wash according to granual 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.

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

NSF Certified

Specifications

Additional Info

Specifications
Model # garnet-sleeve
Material Garnet
Shipping Weight 20

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