My well recently started pumping large amounts of sand and mud through the pipes. I have a well that has been in use for many years and it has always pumped a little sediment, but never as much as it has been these last couple weeks. The water will be running clear one minute, then after a while of usage, the water will turn to mud. I recently installed a spin-down filter and that is having no effect on the purity of my water whatsoever. I am clueless as to what would be causing this situation so any help would be greatly appreciated. Thanks, Josh