This year my pond has had a heavy layer of what I will call carpet algae on the liner all year. I have also had what I will call string algae all over the tubes in the pond as well as a good amount of floating algae that I was netting out every day. Other than that the water is very clean and clear. I came home from work the other day and it is all gone. All of it. Just wondering if anyone has theories why? I have done NOTHING different with the pond recently although at the beginning of the year I did add two good size containers filled with gravel to use as filters.