I would clean the well first. Then when your fishing, you fill the well, add your chemicals, then recirculate. Do not pump in new lake water, just recirculate the well. It took me a while to learn that! Later in the day you can pump in some fresh lake water and start all over again. It's about time to get the ice jugs out too! I lost my first fish in over three years last Saturday. Prior to that I always had problems, but I was pumping in fresh lake water!