Just a warning for newbies like me...Take a look at what happens when you begin to think "if I'm shooting for 10ppm of FC, then 20 would be better". I'm a newbie and my advice to everyone out there is follow the program, follow the advice, and stay the course....listen to the experts.... The severe fading is all my fault, not the forums. Without the deep blue color, my water always looked less than crystal clear. I see a new liner in my future.