I am switching pool close services after some poor service from the last group. I have been letting high CYA drift down with rain and backwashes, and it is now at 65. I am hoping that it will be in range after the refill next spring. Because of the high CYA I keep my FC at about 7.5. If I do a SLAM before closing, I have to bring it to about 25. It will then have to drift down. The pool has been absolutely sparkling and clean since my first total SLAM and now using the TFP method. Pool temperature now is 64, should be 60 in 3 weeks when the close is scheduled. The new service says the chlorine level has to be zero or almost zero in order to bring the water level down, even if I live in the country and we would be just dumping onto the grass. He said it Maryland regulations not to dump water with high chlorine into the water table. My old service didn't worry about this. I am worried that I will do a slam a few days before he comes, and the levels will be too high. It is my first year using TFP and in the past, we just added algaecide and shock. I really want to follow the advice I get here, but I can't close the pool myself, and really don't want to go back to the old service. 1. Has anyone else heard of a regulation like this? 2. Do I skip the SLAM? Do it now so it has time to go down over three weeks? With the leaf drop about to happen, it seems that a SLAM now might be a waste, although I would have the higher chlorine levels to help keep things clean during that time. Thanks for your thoughts on this.