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2.5 METERS OF FILTER ON A THREE-METER POLYETHYLENE PIPEPOLYPROPYLENE FILTER on a polyethylene pipe 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; strength;- simplicity of design;- ease of installation of the well filter; formation opening close to ideal drainage;- the well filter has a wide range of design types and execution options; Pipes with a water intake layer (well filter) made of fibrous-porous polypropylene 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 washing at high speed, which allows achieving a high degree of regeneration;- low hydraulic resistance.