I could use a little help I am a little puzzled. I am a first time pool owner and have been using the BBB from the start. The issue I am having is I am starting to get green spots growing in a handful of places around the pool. The water looks beautiful nice and clear sparkling blue. Ran a set of tests last night with my Taylor k2006 kit below are the numbers.
FC: 2.0 (before adding chlorine)
CYA: about 30 (I think! It is a bit hard to tell).
I did run an OCLT the night before and my FC loss was only 0.2
The other thing I have done is I have been trying to raise the CYA level a little to slow the loss of chlorine as the pool gets 100% sun from sun up to sundown. Anyone have any ideas why I am getting some green spots?
My thought is that since I have been adjusting the CYA levels, I probably now have it above 30 (maybe 35 or so. Definitely not 40 as I can clearly see the dot at the 40 mark) so according to CYA/FC chart my chlorine would be low allowing the algae to start growing. The thing that is puzzling to me is that the water is so clear and perfect and the overnight test has shown no loss. Wouldn’t the water go cloudy or my overnight test show a bigger loss if there is clearly algae starting to form? Is that possible?
The other question I have is about chlorinating. If my theory is correct and I am above 30 PPM CYA then I would need to chlorinate for 40 PPM CYA on the chart. So the min would be 3 with a target of 5. With that in mind under normal circumstances to me that would mean I would need to shoot for 8 PPM when adding chlorine if my normal usage is 3PPM per day. Does this sound correct? Is it safe to swim in with that much chlorine? How high a level of chlorine is safe without any negative effects?
Thanks for the advise. I have gotten so much good information from this site