Just finished a day in the pool with lots of kids and noticed a small amount of fecal matter in the bottom of the pool at the end of the day. I tried to get it out, but it kind of broke apart as i tried to remove it. I have the pool cleaner running in the pool now and FC is at 5 ppm. Should I just continue to maintain the appropriate FC for my CYA level or is it important to shock the pool at this point. Again.... it was a very small amount.