I am waging a battle against whatever is in the pool and feel like I am losing! Currently I am following the "shocking your pool" process as outlined in pool school. But my question is, is there ever a time when you would want to drain the entire pool and just start over? Right now, we are on Day 4 of shocking and are not making much progress. I wonder what the experts have to say on when, if ever, one should drain and start fresh?