With a CYA level of 100, your shock level is 25 ppm. Shock as I described in my first post until the chlorine stays at the same level overnight. To clear this quickly, it's very important to test often (at least 3 times a day) and keep bringing the pool to shock level after each test.

Keep brushing; the more the better. If you don't have a manual vacuum, the Polaris may help some.