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High pressure Stainless steel Gravel Pre-packed water well sand screen in hot sale  consists of one screen telescoped inside another, with an annulus filled with filter pack at the factory before shipment. The pre-packed screen is designed especially for high capicity wells, these screens offer unique advantages over conventional rod based screens with respect to strength. it features include: collapse strength equal to pipe; double the tensile strength of standard rod based screen; a bioresistant, hydraulically superior (to silica sand) pack; a greater percentage of open area(for deep applications) than that of a conventional screen, due to the dual support construction.

 For the pre-packed screen, base pipe can apply perforated casing with API standard, bridge slot pipe, or continuous slot well screen, while in the middle layer, the filter media could be quartz sand, wier mesh, metal fibre,ceramic beads , etc. The screen jacket could use continuous slot screen, bridge slot pipe.