I have friends who shocked their well with bleach over the weekend. They are turning on the hose to clear the system but are afraid to run the pump too long thinking it may burn up. They are running the hose in 1-2 hr. spurts then letting the pump recover for a few hours. I'm afraid this will take too long to clear the system and the bleach sitting in the well will damage metal parts. How long can the pump be safely run at one time? Any help will be appreciated.