Yesterday, my pool was a perfect sparkling light blue. Measured my free chlorine at 4. Yesterday a set of thunderstorms came through and the pool immediately turned green. I have a lot of oak trees around the pool and earlier and suspect that the green pollen that falls from the oak trees looks suspiciously like algea. It takes a while for the filter to filter out the pollen.
I'm not sure about this one. It happened so fast and the water looked so good just before. Any thoughts would be appreciated. I don't particularly want to purchase dozens of bottles of unnecessary chlorine unless needed.