I run my pool with a CYA of 30 and keep the FC around 3 or so. On a day like today with heavy swimmer load and lots of sun, I will check the pool at 8AM and it will have 3 FC but by 4PM it's down to 0 FC.
If I load back up the clorine to 4 - 5 FC, what's the best guess of running into a problem with algea? Wouldn't it would take more than a few hours of time before it would take root? I have no issues with the water, it's crystal clear and 80 degrees. Just curious what my risks would be as I've only shocked the pool once this year after a heavy rain storm. This situation of 0 FC happens maybe 1 a month.
Based on these types of days, I'm thinking I will be boosting my CYA up into the 50-60 range to help buffer a little more.