For the last week I've noticed when I brush the pool there is a greenish cloud that swirls up around the broom. I've never let my FC drop and even in the hottest summer months, when I'd suspect algae would be a bigger problem, never had this occur. The pool water has cooled considerably to mid-70s and I started noticing this. I wouldn't even know it's there except for when I sweep. The pool water is crystal clear.
I tested tonight and have no CC, FC levels were around 5. (2-6 is my ideal level according to PC). I'm stumped as to why this is a problem all of a sudden.
Anyway, I brushed the whole pool, brought it up to shock level (actually overshot it by quite a bit), and will test again in the morning to see where I'm at. My ideal shock level is 13. I added what PC estimated but ended up at 18 ppm FC. Since I've got plenty of wiggle room, I figured I'm probably ok not testing again tonight and will see how much FC I lose overnight.
I just find it odd seeing as it has been "cold" here in Central Fla. and I managed to survive the hot summer without a bit of algae. Just frustrating.