Just joined -- this is my first post. As for your sand problem -- I've read most all the kind responses. I know next to nothing about wells but it seems you can do little to nothing short of a new well to fix the problem there. If it were my problem, I would do two things (or have them done as they are intensely plumbing related): I would install a water tank on the well output to serve as a settling tank. The idea is to reduce the water velocity which keeps the sediment in suspension. In a tank, the water slows and much (eventually all with no water use) of the sediment drops to the bottom of the tank. I would scout around for a used water heater -- only requirement is that it not leak. If you can't find a junker, check Habitat for Humanity stores if one in your area. Theirs will work but still might be less than $100. Connect it in series between the well and the gshp. Periodically use the flush outlet on the bottom to remove the sediment. If you still have a problem with fines, then I would rig two screen filters (two so you would never have un-screened water) on the water heater outlet, such that while one would be in the water path, you could divert the water in the other one in reverse, flushing the sediment into a drain without having to remove the filter. This would require a number of valves, and if shutting off your water for 10 minutes once per week or month is not an issue, then you could do it with one filter at half the cost.