I understand. In the future, which hopefully you never have to SLAM again, don't go so high over SLAM FC. A couple ppm FC, OK. But it really does no good to go so high. The majority of it is burned off by the sun very quickly. As long as your FC is above minimum, it is killing algae, just not as fast as if it was at SLAM level.Could be the case. I wish I could test and add more often but unfortunately I must work all day to pay for things like this pool.