I am ready to retire the old Polaris 280 and buy a robot, and had decided on a S200 or other-badged equivalent from Marina. Looking at the specs it appears that 4 ppm is the max FC for use. My target FC range stays at 5-7 ppm most of the time. Does anybody have any experience to share? Will 1-3 ppm over the recommended max FC ruin the machine? Thanks