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Prefilter is widely used in industry or daily life. Today, we talk about why prefilter is installed with filter screen? Pre-filter filter filter accuracy is generally 40-100 microns, can filter to the naked eye impurities, such as sediment, rust and other large particles, generally installed in the front end of the pipeline, is a reliable impurity filter device, so, how to use the pre-filter? Here is the common domestic water pre-filter to do some analysis, convenient for everyone to understand its usage and function: a, the pre-filter in what position the pre-filter is generally installed in the front end of the pipeline, so in front of the two words to name; Filtering refers to the rationale behind such devices. Two, what structure of the prefilter is usually type structure. The left and right ends of the above position are inlet and outlet respectively. Below is the fuselage and the interior of the barrel filter screen, the bottom is the sewage outlet, by a valve to control the opening and closing. 1. The precision range of the filter screen varies from 5-300 microns according to different brands and models. 2, the main removal of pipe generated by precipitation impurities and bacteria, microbial debris, rust, sand and mud particles more than 5 micron impurities, to avoid human body and skin damage, and the downstream pipeline, water purifier, water heater, washing machine, high-grade faucet, shower play a positive role in protection. 3, the prefilter can also add complex phosphorus hydrochloride; Scale inhibitor filter element acts as scale inhibitor for solar energy and boiling water device. Four, the importance of the pre-filter is usually installed in the water inlet pipe after the water meter, to ensure that a large number of precipitation impurities generated in the pipe network will not cause harm to the human body, and to the dark coating of pipes, faucets, electrical appliances, and play a positive role in the protection. Prefilter is the Nemesis of secondary pollution and is a reliable impurity filter device.