Finished SLAM (I thought). Is this algae?

[thechairperson]

We finished our SLAM and swam yesterday. Woke up this morning and looked at the pool and found little spots with streaks (see attached pictures). I tried to brush the areas and the spots floated around, but the streaks remained on the plaster. When I used a net to take one of the spots out it seemed to be something like algae. Maybe I'm not keeping my chlorine high enough?

 

[Mr Bruce]

My nemesis! Tannins! Those trees are dropping things in your pool and the tannins are staining your surface.

Eventually the chlorine will take care of it. For stains bigger than a quarter I put a puck on them for 30ish minutes and they're gone. You don't want to leave a puck on the surface too long though.

 

[thechairperson]

Thanks @Mr Bruce So unless they are larger, no need to worry about them? I LOVE my trees but they definitely make for more work.

 

[Mr Bruce]

I mean it's just cosmetic, you don't HAVE to worry about any of them. I just let the little seed ones fade with time but the "nut" ones drive me crazy so I do the puck trick.

You can also elevate your FC somewhere between the upper target number and SLAM levels. For example, with a CYA of 50 somewhere between 10-15. That'll make them go away quicker as well.