First off I have searched your forum for this answer and could not find any, if I have missed a pertinent thread I apologize.
I have a shallow well (13' from well head to bottom) that holds ~ 3' - 8' of water (water table rises and falls with rain) the diameter of the iron pipe is 8". The recharge rate of the well is very good. My problem is in dryer times the water pumps below the foot valve and ruins the prime of the pump. This is not always noticed and the pump can run unloaded for too long. Plus not everyone is able to reprime the pump. What I am looking for is a solution where the pump is shut down when the water level reaches 1' and waits till the level recharges to 2 or 3 feet (adjustable would be nice). Typical float switches will just bind up in the pipe (8" dia.). There is a high Fe content in the water so I am not sure if electronic switches would foul (or bridge) due to deposits. What would be ideal would be like a sump pump style switch that is submersible with a 2" dia. vertical float and 2' long adjustable travel rod. I have scoured the internet for days, but perhaps am not using the right words in search. Another possibility would be a pressures sensor hooked up to a bladder near the foot valve and a relay controlling the pump with adjustable on/off settings.
If anyone here know of a product like these (or any other solution) please help me out. I can't be the only one with this issue.