The water right now is very clear, but looks a little glossy due to the high FC level. About a week ago after a storm I noticed the pool lost its shine and was a little cloudy, so the FC was around 4 and I brought it up to 12 and vacuumed. I put in some algaecide (which I don't normally) and the pool cleaned up, about a week later I noticed the bottom was a little slick and very slight indication of algae in the water as I describe below.
I have a full sun pool and I run a SWG. My problem is that my pool always seems to develop specs of algae. If I put on goggles and look at the seams where the liner is bonded, the crevices around the pool light, and the outer rings around the pool returns I can see little bits of a green outline (maybe like the thickness of a credit card. When I see this I will brush it (top off the bleach manually), but it will come back in a week or a little more. I know I need to slam the pool, so that is what I'm doing. I keep a good eye on my water condition, but always find signs of algae a couple weeks after the slam. When I open the pool each year I bring it to shock level and let it sit there for at least a week and make sure to pass the 3 slam tests. I don't install the ladder or the light until all is well. However, eventually I see these slight signs of algae. I want to bring my cya up to 70, but I worry about needing to slam the pool again. I'm thinking about running my SWG at a slightly higher range maybe 8-12 FC. I am baffled by how public pools can keep their water in line and never have to close the pool because they are shocking it. Also when I'm done with the slam would it be safe for my kids to swim if the FC is below 22 and the CYA is at 55.