I have mottled green stains on the sides of my pool that began cropping up a couple of days ago. I added bleach and have had my FC running between 26-30 for 24 hrs. My CYA is 60. I know that needs to be a little higher. My problem is that the green stuff is REALLY tough to brush off. I'm using a new metal brush that I just got from my pool store. (They don't carry algae brushes.) It comes off easily in places with a cheap hand held brush. Could the surface of my walls be so uneven that the metal brush isn't making good contact or have I not been shocking long enough? My water is clear.
Also, I have brown stains here and there on the bottom of my pool that I'm assuming are from leaves that sat for a few days when we were out of town. They haven't faded at all yet. Do tannin stains fade out gradually? I haven't tested my water for metal and I did use an algaecide once from my pool store before I found this site. My pool store did tell me that shocking wouldn't take care of organic stains. I kinda changed the subject.
Thanks in advance!.