Update: The previous evening I brushed and shocked. The next morning I had no change in FC & CC readings. Last night, for the sake of being throrough and aggressive, I brushed and shocked again, bringing the FC level up to 32. The FC dropped to 28 this morning, and CC was at 1. I suppose this means I still have algae to contend with? I will shock again tonight.

On another note, I spoke to the builders of my pool and they sent me a copy of the original blueprints. It is 16 X 40, 24,811 gallons (I was close in my estimate). Pool is older than I thought....35 years.

Hayward 220ST filter, 1 HP pump.