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The GEA filter is the first coarse filtration device for whole-house water use, capable of filtering large particles such as sediment, rust, insect eggs, and midge larvae from tap water. Pre-filters are generally installed at the front end of the pipeline, hence the name "pre-"; while "filter" refers to the basic principle of such devices. A filter (filter) is an indispensable device on media transport pipelines, typically installed at the inlet of pressure reducing valves, relief valves, constant level valves, and other equipment. The filter consists of a housing, stainless steel filter screen, sewage discharge section, transmission device, and electrical control components. Applications include industrial wastewater, circulating water filtration, emulsion regeneration, waste oil filtration treatment, continuous casting water systems in the metallurgical industry, blast furnace water systems, and high-pressure water descaling systems for hot rolling. It is an advanced, efficient, and easy-to-operate fully automatic filtration device.

GEA Filter Introduction

It typically features a "T" type structure. The left and right ends of the upper horizontal section serve as the water inlet and outlet. The lower vertical section houses the body and the internal cylindrical filter screen, with the sewage outlet at the bottom, controlled by a valve for opening and closing. The filtration precision ranges from 5-300 microns depending on the brand and model. It mainly removes precipitated impurities generated by pipelines, as well as bacteria, microbial residues, rust, sand, and mud, specifically particles larger than 11 microns. It is usually installed after the water meter on the inlet pipe to ensure that large amounts of precipitated impurities in the network do not harm human health, and to provide positive protection for concealed pipelines, faucets, and electrical appliances. The filter is the nemesis of secondary pollution and is a reliable impurity filtration device.

GEA Filter Working Principle

When flushing retained matter is required, the flow direction is reversed manually or automatically by adjusting the multi-way diverter valve integrated into the filter, causing raw water to flow from the clean water side of the filter screen (core) to the raw water side, achieving backwashing. Common backwashing pre-filters typically operate in an "internal pressure" mode (as this structure facilitates multi-way valve design), where tap water pressure permeates from the inner wall to the outer wall of the filter screen (core). Granular impurities such as sediment and rust are retained inside the tube. Opening the flush valve washes away the impurities trapped by the filter screen. If water quality is poor or the user does not flush for a long time, clogged filter pores are not a concern. Through the backwashing function, an "external pressure" mode is formed, washing away impurities embedded in the filter core pores that could not be removed by forward flushing. Compared to previous models, backwashing pre-filters represent a significant technological improvement. The flushing design is reasonable, allowing flexible forward and reverse flushing to thoroughly remove impurities and prevent secondary pollution caused by impurity accumulation.

Wide Application of GEA Filters

Fine particles can cause pressure reducing valve failure in a short time (leading to dripping in disc-type ceramic valve cores), blockage and rupture of heat exchanger pipes, and impurities will precipitate on the pipes. This provides a breeding ground for bacteria and forms electrochemical compounds. It can filter visible impurities such as sediment, rust, and floating matter, greatly extending the service life of downstream equipment. In Germany, legislation mandates that all buildings constructed after 1994 must install pre-filters. They are widely used in general water supply filtration systems for the food, textile, mining, electronics, and casting industries. Nozzle water filtration for the pulp and paper, metallurgical, and mechanical industries. General circulating water filtration for the food, electric power, mining, and smelting industries. Filtration of cooling tower circulating water for pharmaceutical, petrochemical refining, air conditioning, or heating systems. Pretreatment for sewage ion exchange in petrochemical, electromechanical, and pharmaceutical industries.

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