It would be good to know just exactly how much sediment your well is producing but if you are chewing pumps every 6 years I'd say it's pretty bad. Here's the real problem. That sediment will eventually fill the well until it is at the pump which means you raise the pump and wait for it to happen again. I have put what is called a sock ( a fiberglass mesh bag ) over pumps before and they do extend the life of the pump but again, eventually the sediment gets at the pumps level and the troubles start all over again. I know you don't like the idea but a new well is your only real solution. Everything else you do will be stop gap at best.