For the first time in 7 years, I've had some mild algae issues with my 7-year old pool. Water was clear all summer, but there's been a couple of spots that I needed to brush every week or two to to prevent a bloom. I've maintained my FC level at around 4-7 ppm (CYA ~60-80) throughout the summer. Not sure what caused it, but it might be due to a bloom that happened in early spring when I was away for a week and a freak storm dumped all kinds of **** into the pool before I turned on the SWG.
Here in SoCal, there is no need to close my pool. Water temps drop into the low 50's and there's really no reason to worry about algae even with zero FC. I normally try to maintain a 1-3 ppm level with bleach, but I don't worry too much about it.
Will the residual algae be completely killed off by the cold temps? Or is it worth it to SLAM my pool beforehand? If Shocking is necessary, it is best to do it now or wait until the spring.