Last night I back washed the filter. And of course I forgot to rinse it. All that muck went straigt into the pool. So after promising the kids and hubby last week was the only time I would have to shock the pool this summer, I am back to square one. I raised the Fc last night to 15 hoping that would be enough but it wasn't. all day the cc has bee going higher. last test was fc9 and CC 1.5 A weekend of can we get in yet? over and over is going to be fun. brush, vacuum, brush, vacuum, rinse repeat. off to buy more bleach....