The Well Casing can be perforated with a 4" diameter tungsten carbide blade in a small skill saw as shown or various other blades can be used in an angle grinder. Thickness of blade shown is 1/16" but thinner or thicker blades are available. The average well is perforated from 2 ft. above the aquifer down to within 2 ft. of bottom of the well. Slots are cut in every second hollow as shown, four to six evenly spaced rows around pipe, depending on individual well conditions.