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Pipe length - 3 m; Spray length - 2.5 m. Filter with polypropylene spray d125 with casing pipe wall thickness 6.0 mm is used in almost all non-suffusion non-cohesive and cohesive soils; - protection against penetration of root tissues and sand into the filter pipe; - possibility of use in neutral, acidic and alkaline environments with high mineralization of groundwater; - well filter has high mechanical strength; - simple design; - ease of installation of the well filter; - high performance characteristics - the design is close to an ideal drain in terms of the nature of reservoir penetration; - well filter has a wide range of design types and versions; - filter coating complies with TU U 25.2-32 556556-001-2003 and is approved for use by the Ministry of Health of Ukraine. Fiber-porous polypropylene pipes compared to analogues have an optimal ratio in terms of: - filtration rate; - one of the best filter cycles; - high quality of purification from suspended solids; - protection against penetration of root tissues into the filter pipe; - increased dirt capacity of the filter; - possibility of high-speed flushing, which allows achieving high st