my email : info7356@guangxing-screens.com .well screen (water well)
I'm Joanna sun from China hengshui guangxing screen
  Guangxing screen company is a professional manufacturer of wedge wire screen ,Water well screen with liner tube for oil & gas well,johnson well screen ,oil well screen wedge wire screen,water filter pipe, 

Each slot opening of Johnson well screen between adjacent wires is V-shaped, resulting from the special shape of the wire used to form the screen surface. The V-shaped opeings, designed to be nonclogging, are narrowest at the outer face and widen inwardly.

Continuous-slot Johnson deep well screens(water filter screen) provide more intake area per unit area of screen surface than any other type. For any given slot size, this type of screen has maximum open area.

well screen (water filter)Material: Low carbon galvanized steel (LCG), steel treated with plastic spraying, stainless steel (304,316etc.)
Length: lengths up to 6 meters.
Diameter ranging from 2 inch -----45 inch.
Slot size: 0.10, 0.15, 0.20, 0.25, 0.30,....., 3.00
End connection: Plain beveled ends for butt welding or threaded.
Open area up to 60%.