Quote Originally Posted by hausfrau View Post
Did all of that. Honestly, we have tried it all. Still there...a little worse. Is it possible that minerals or something is leaching from the gunite that can cause stains which are almost impossible to remove? The pool's gunite cured during heavy pollen season. The pool is under trees. If the plaster folks did not wash out all of the pollen properly..could this be causing a problem?
In a word, no.
Pollen floats on the surface and does not stain under the water. It can deplete chlorine and allow algae to grow. Your description of the problem and how it occurred and the things you have done to treat it leave no doubt in my mind that you are dealing with algae and just not doing what you need to do to get rid of it. First step is a good, current CYA reading.