Selecting Model Numbers - Choosing the Right Filter Filtrex units are supplied in various sizes, type of materials and service configurations. The following is a breakdown of the Filtrex unit numbering system.

The Filtrex systems are available in several sizes, degrees of filtration, system control options and material of construction. Many factors are carefully considered when selecting the appropriate filter elements and housing. The following is a brief description of the most important factors: Nature of Contaminant It is important to determine exactly what the filter is required to remove, and whether this material is hard, fibrous or gelatinous. This determiniation will assist in selecting the correct filter media and backwash specifications. Degree of Filtration In general, the "finer" the filter medium, the more costly it is. Therefore, the most economical filter selection is accomplished by determining as precisely as possible what removal rate is required to meet the particular filtration application. The most effective way of determining the removal rating is by conducting field tests. As this is not always possible, the following guidelines will be helpful: To protect nozzles or clearances against plugging, select a rating that is half of the diameter of the opening to be protected. To remove visible particles, a 40 or 50 micron filter should be specified. To produce optical clarity in a liquid, a 25 micron or finer rating is required. To remove a haze from a liquid, a 10 micron or finer rating is required. Compatibility to the filter media In order to insure proper filtration and system integrity, the filter media must be compatible with the material to be filtered. Knowledge of the operating conditions, such as the temperature, maximum differential pressures and service pressure are also important. Housing and system material Material of construction must be compatible with the process in which it is being used. System size Flow requirements, dirt loading, viscosity of fluid being filtered and pressure drop requirements will determine the number of filter candles necessary, and thus the size of the housing and connecting pipes. Since Filtrex supplies custom made units, sizing available on request. In the filtration technology it has always been the desire of the people involved in this industry to produce a filter media that is characterized and distinguished by a high open area ratio. This parameter defines the ratio of a media's pore area as a percentage of the materials total surface area. The filtrex element design not only achieves this, but also a permanent media with a superior ability to self-clean in seconds.