View down the well casing. Filter is at the bottom with a piece of lexan screwed to the open end with stainless screws and sealed with silicone. Inlet tube goes down center to bottom of filter. Filter held down with another 1/2" PVC tube with screw eye screwed into top of filter. Water level sensor adjusted to shut pump off when level drops to top of filter while pumping. All materials down well are now plastic or stainess so no rust.

Added green 7/16" SonopanX box to small well pump to reduce noise. Sealed with acoustic sealant. Could be heard faintly upstairs previously  but not any more. You can see the plastic filter hold down tube on the left  and water level sensor 1/2" PVC tubing on the right. Stainless wires on sensor screwed to a phone jack connection then phone extension cord goes to another jack at the controller. Phone extension cords are used for long wire connections. Blue tubing is insulation over stainless wires at the top only.