I have poured over this site for a year now and have learned so much about pool ownership!
I do however have one on-going issue.. Sneaky green alage! I Shock my pool, vacuum to waste 24 hrs later and enjoy a perfect pool for about 3 days... Then it creeps back in. I need to mention that my water is always crystal clear, however the alage can be seen growing in the corners etc. The thing that gets me is that the alage starts to grow while my FC levels are still high 12 ppm. Why is this happening? cYA is 45 on average.
I feel like I'm getting all the alage when I brush/shock/clean, where is it coming from??