Industrial Multi-Media Water Filters (“MID”)

Industrial Multi-Media Water Filters (“MID”) or Multi-Layer Sediment Water Filters (“ML”) are high-efficiency, in-depth filter systems using a layered bed of anthracite, silica sand, and two grades of garnet for excellent filtration down to 5-10 micron size. Multi-media water filters have the highest service flow rates available in a pressure-type filter and are suitable for the final filtration of most city water and well water supplies. Note that these are not recommended as the primary filtration means for extremely high turbidity applications. For high turbidity and TSS (total suspended solids), ultra-filtration UF systems are ideal and filter down to 0.02 microns.

How To Size Industrial Multi-Media or Multi-Layer Water Filters

Try our free multi-media water filter sizing calculator.

In addition to the service flow, the selection of a multi-media filter or multi-layer filter must take into account the available backwash flow rate. This is the most important function in the proper operation of a filter for industrial water purification. Periodically, the accumulated impurities (iron, sediment, etc.) must be removed (backwashed) from the filter. Backwash flow rates are always much higher than service flow rates and therefore limit the size of the filter that can be installed. If backwash rates are an issue, ultra-filtration UF systems can be used as they have much lower backwash rates. As a general rule in sizing MID or ML filters, select the largest filter that can be backwashed with the flow rate available at the point of filter installation, then note the service flow rate for the filter selected. If it is not adequate for the flow to be treated, a twin or triple filter installed in parallel is required. A parallel installation will increase the service flow while permitting each filter to be backwashed separately with the existing water supply.

Industrial Water System Service and Industrial Water Purification Service

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