Hi Dave and thanks for the reply. My FC levels were close to 15ppm last night. I threw in an extra 1 1/2 gallons of Clorax for good measure (to last through the night). When I tested this a.m., they were at 15ppm - so I was baffled that the FC levels were still up (lasting through the night). I didn't expect to maintain those levels until the pool was clear. It's a sunny day in New England so I'm sure the sun should eat up the FC levels.

Should I be testing for Cl or is that the same as FC??