The bridge slotted screen for water well is currently the most used, because this has a good technical / price features. Slowly the excellent characteristics of the spiral screens are convincing planners, geologists and drillers to replace the bridge slotted screen with spiral screens for filter pack in water well even though slightly more expensive.
On the ground tests carried out in laboratory, it has been established that in bridge slotted screen with 1,5 mm slots and a percentage of open area of 13%, the head loss of the water flow is very low, since their hydraulic conductivity is higher than 3,3 cm/s, which is a value much higher than the one of an excellent water-bearing soil.