Our pool has been set up about 2 weeks, starting with a regular chlorine filter and just 4 days ago switched to a sand filter and the saltwater system. It was clear and fine until yesterday when I noticed all the slime. We did not fill using well water, just city water. The levels have been kinda low (ph), but chlorine seemed fine. I think I will add bleach tonight. What about shock? Can you explain what exactly that does? I'm worried because we go on vacation for over a week in a couple days and I can't imagine what it will look like when we get back!