Marty will have to chime in why he wrote it like that. Maybe he was just keeping it simple. You're right, the SLAM numbers are the same. Test your CYA, find your SLAM FC level and proceed. I think the more important part of his post was cautioning you not to use your SWG, which, I admit, would be tempting, to help you maintain the SLAM level. But you don't because part of the process is monitoring how much your FC drops during the SLAM, even hour by hour. If your SWG is on, it skews the process, as in: you think the FC is holding, so you think the SLAM is over, when really it's the SWG that is keeping the FC up, and your algae is still there, just using up your chlorine at the same rate your SWG is making it. Something like that.