Excellent. Let me explain where I am coming from and ask a more specific question. I had recurrent algae issues mainly due to a misunderstanding of my required FC level and an ignorance of how CYA levels affect that. As I learn the TFP method, and switched over to bleach and raised my FC level, I removed the algae chemically, manually, and automatically, except perhaps in small spots where it may hide and persist. My OCLT was 0.2ppm. Then I found a couple of small spots of green algae on the walls, measured in square inches not feet, and brushed the walls.
My specific question is how far do I have to take this? Is there some point at which it if is clean enough, it WILL NOT grow back as long as I maintain at least the minimum
FC@CYA level? Or is it everpresent, entering from the air, and going to invade at the first drop of FC on a warm sunny day? Is the attempt to erradicate algae simply OCD or prudent vigilance?
Cheers,
-R