From reading this forum.., i am beginning to think that something like half the pools in the country must have some level of algae problem
I have owned my pool for about 11 years - until this year, i never really paid any attention to the upkeep.
The pool guy came once a week.., I had no idea what he was doing.., and we used the pool.
we were not a high-usage family - my kids were away at camp or wherever most summers.
I had chronic algae problems, at what i would call a low to moderate level - occasionally after a few days, a little algae would grow on the wall, so if I knew we would be using the pool later that day, i would brush and vacuum it in the morning. often i had to vacuum anyway to get rid of things that had blown into the pool.
i never had green water - it usually wasn't crystal clear.., but it was usually pretty good.
I have since learned that my CYA was over probably 100 for much of that time.., and my FC was being maintained at about 2 to 3ppm. I realize CYA has been increasing, but I probably never had the correct FC level for the CYA at any time since i bought the house!
I guess what I have learned is that while the algae itself isn't that unhealthy, an environment in which algae can grow.., is also favorable for the growth of certain pathogens that can cause illness.
it seems like at my CYA and FC levels.., I should have had a pretty toxic pool - yet to my knowledge, no one ever got sick
i think my pool is a bit cool by TFP standards - averaging 79-81F, occasionally hitting 82, but never higher.
This is not to imply that I am doing nothing about my algae problem - I am presently replacing water.., and will slam the pool when i get to a reasonable CYA level. I will probably buy a SWG, and fire the pool guy next year.
still, i would bet that a huge fraction of the pools in america are under-chlorinated w.r.t. the CYA content.
Is there any reliable information on how common pool-caused illnesses are?