You need to keep your FC level at 15 a minimum of 3 x a day, the more the better. I added when I got up first thing in the morning, when I got home from work, and before bed. Also, you should run your filter 24/7 and backwash often, keeping an eye on your pressure. It takes a lot of bleach to convert, so keep plugging away. The reason you are having problems keeping your chlorine levels up is because it is being used by the Baquacil. You need to keep adding bleach until you can keep a FC level of 15 PPM overnight. Hang in there, as it will be worth it in the end. Good luck!