HI have a SWG pool that has a high FC level, My tester indicates around 10 on the dip stick. My SWG was set at 50%, basically the same setting it was at all last year. The only difference this year has been the use of a solar cover (also the weather has been cool). Will the cover and weather hold the FC from breaking down? I just reduced the SWG from the 50% to 35% in the hope it reduces the FC. All other chem looks normal. FYI the pool is 13,500 gal, vinyl, in ground.