We recently had some warm weather here in Eastern PA and I did not check my pool water temp, but over the last 3 weeks my water went from clear to green. My AG pool remains uncovered all winter as we have no trees around our home and it generally remains clear all winter long, as I close after the water temp goes below 60F. I checked the water temp today and it is in the mid-40's.

Any ideas as to why it greened up so quickly. Its only March!