I don't know anything about the 'SLAM' method... but wondering why it would take "days" to kill algae? Is that normal for this 'SLAM' method? All you need to kill algae is a gallon of acid and several jugs of chlorine. If you add the right amount of chlorine/acid, it should not take more than one shot (and 24hrs) to kill all the algae - 2 shots at most (and that's usually because you didn't add enough chlorine to begin with)... I guess none of this is really useful information to you now as you seem to have things under control.
Mod Note: This is NOT TFP approved. Please see next post.