Typing excused if you excuse my total ignorance of home repair.
Yes, I do know to turn the water off, if not much else. We've had enough leaks and clogs that required that step. But thanks for the reminder anyway. I can use all the help I can get.
Ok, I found Supco.com with a good description of a filter ... two actually with one for 1000 gal and one for 4000 gal but so far I have not found prices or where to purchase.