Well, I think my pool said UNCLE. Over the weekend, I stopped running my pump overnight. By Sunday morning, the pool bottom was covered with powdery crud. I vacuumed that to waste and then added LC. Then, I ran the equipment for 4 hours. This same thing was repeated Monday and Tuesday. This morning, the pool is quite clear and FC seems to have stabilized.

Thanks for everyone's help.

Cheers from the Sierra Foothills,
Paul

If stupidity got us into this mess, then why can't it get us out?
Will Rogers