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Monday, January 18th, 2021
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Sediment Filter

Sand_Filter: Yasric - SD Filters:  Commonly used in most standard industrial water filtration_systems for removal of suspended_solids_and_turbidity.

In-Depth_Filter: Yasric ID Filters These beds are composed of several layers of different media size. In-depth filters allow higher loading rates and longer runs. A sand and anthracite bed is a typical industrial configuration. In-Depth filters will remove sediment down to the 20-30 micron range.

Multi-Media_Filter: Yasric MM Filters:  Consists of multiple layers of sand, anthracite and garnet. Multi-Media industrial water filters remove sediment down to the 10 micron range.

Multi-LayeredFilter Application / Uses 
Multi-layered filters have a unique filtering ability due to the reverse grading of the media. With the coarsest layer at the top of the bed and the finest layer on the bottom, the filter is able to retain finer particles, operate at higher flow rates and be loaded more than other types of sediment filter. It is used for the heavier filtration jobs such as cooling tower recirculation water or surface lake or stream water. Multi-layered filters provide excellent protection ahead of water softeners or reverse osmosis systems to remove turbidity, sediment and oxidized iron.

 Process Theory 
During backwash of other types of sediment filters such as sand or agracleer , The finer particles of media are pushed to the top. The filtering process occurs at the top of the bed where the sediment collects until pressure drop dictates cleaning by backwash. Multi-layered filters contains the coarsest layer on top of the bed and the finest layer on the bottom. Sediment dose not collect heaviest at the surface but collects through out the entire depth of the media. This permits operation at higher flows without creating high pressure drops. Longer periods of on line time result between backwashes. The finest layer of the media at the bottom dose not become fouled with the coarser sediment. Therefore an extra fine material can be used to permit used to retention particles as small as 10 microns. More other types of granular filter media have a particulate retention rating of 40 microns. The top layer of coarse media is the latest dense, while the bottom layer of fine media is selected to have the greatest density. During backwash this insures the layers of media are maintained in the proper(reverse graded) order.

For removal of both heavy sediment and suspended matter, the multi-layered (Multimeda_filter) bed contains a number of distinct layers of media.

The specific gravity and size of the various layers have been selected so that the layers cannot mix but will always stratify in the same order upon backwashing. Because of the reverse grading, collected suspended_matter will not from in a layer but rather be collected through the depth of the bed. The unique multi_layered feature has advantages over conventional filter beds. It is able to contain substantially more sediment before pressure_drop dictates that backwashing is necessary. It is able to filter at high flow rates of from 10 to 20 GPM per square foot depending upon desired length of service run (higher rates reduce time online before backwashing and reduce water quality). It is more able to handle surges in flow rate without unloading or leaking some of the collected turbidity.

High_backwash_rates are required to properly expend the bed and release the entrapped sediment

AG_Agracleer_Filters : Yasric AG Filters: For removal of typical suspended matter (for dense sediment use sand filters). 
The agracleer media is a nonhydrous aluminium silicate. It is a lighter weight material able to handle large removal loads and yet be effectively cleaned with low backwash rates.

This low backwash_requirement is an important consideration in keeping pipe sizes to a minimum and in the conservation of water.

The grains have an irregular surface that make an excellent collector of suspended matter and thus produce a high_quality_filtered_water.

Collected sediment is easily removed by backwashing at low flow rates. This low backwash requirement is an important consideration in keeping pipe sizes to a minimum and in conservation of water.

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