Johnson tube, also known as filter tube, is composed of V-shaped winding wire and supporting bar. Each intersection point is connected by welding, which has strong structure and good mechanical performance. The V-shaped section avoids blockage and ensures smooth water flow at the same time. The continuous gap has a larger water area, and at the same time, it can reduce the seepage velocity of groundwater, avoid sand entering the pipe under large water pressure, and have better sand filtration property. The gap can also be changed according to different geological conditions.