Thanks Watermom. TC was still 25ppm at the 8pm reading so no dose of bleach at nightfall. I'll see what the TC is in the morning and report on the level, dose, and water clarity.
(Note: I'm using the shotglass method to measure TC with OT chlorine test until my R-0871 refill arrives later this week.)

Watermom wrote:
Don't add the Fiber Clear. I don't know what that is and you don't anything else that might contribute to the problem.
I found the a couple references to Fiber Clear in this forum from about 5 years ago - http://www.poolforum.com/pf2/showthr...r-sand-filters.
Oh, and here is the MSDS for Fiber Clear http://www.fiberclear.net/images/msds_091405.pdf.

Even so, I agree that I don't want to add any variables, so I'll pick up some DE tomorrow.