It won't hurt to go to 16 ppm for your FC. Don't go any higher as you will start to get too far above the suggested guide line of 12.
There is no black/white level of FC where you pool will suddenly blow up if you exceed our guidelines but use some good common sense and stay close
There is no black/white level of FC where you pool will suddenly blow up if you exceed our guidelines but use some good common sense and stay close