Algae in a clear pool


New member
Aug 24, 2007
I am having a problem with a green algae ring around the outer edge of the pool . It seems to have started after changing the pump ( down graded from 1.5 h.p. to 1 h.p. ) choline level and p.h are in range and pool water is crystal clear . . The pool is a 15000 gal., above ground pool and I am running with a d.e. filter . Also I have changed the D.E. atleast 3 time this summer . I also have discovered a couple of leaks in the liner which I have repaired . The liner is 12 years old . This green stain comes off with a little elbow grease, but comes right back. Any help would be great.


TFP Expert
Platinum Supporter
LifeTime Supporter
May 7, 2007
Silver Spring, MD
That sounds like what happens when you have algae in a pool with low phosphates. In any case you need to shock the pool in order to kill the algae.