Mustard Algae???

[Styxbb]

About 3 weeks ago, I was a bit lax with my pool and came home to a green pool. It wasn't to terrible, so I just got it cleaned up and never SLAMMED. Pool looks good/clear. BUT, I keep getting persistent spots of algae in my pool. Especially the south side(shaded). I started a slam on Friday night. Saturday morning, I had lost 1.5 ppm of FC. Sunday Morning 1 ppm. This morning, maybe .5(if any). So, I am declaring victory on the OCLT. BUT, I still see some green spots on the bottom of my pool....not dead. See Picture(The pic is the bottom of the deep end...8 feet.) Now.....here is the caveat. Some idiot diy'er measured and replaced his own liner(that idiot would be me because I inverted a measuring on the form.) Therefore, I have wrinkles in my liner(This was done about 10 years ago.) I've never had problems like this before. I have been swimming around with a hand brush to clean the wrinkles. I am going to brush and hand clean the wrinkles now, then bump to mustard algae level. I read the article about mustard algae and cleaning everything thoroughly. BUT, how do you clean the solar cover? Does all of this sound like I'm doing the right thing?

TIA

 

[JJ_Tex]

I'll let someone else comment on the solar cover, but remember there are 3 criteria to end a SLAM. While you passed the OCLT, if you still see algae spots you do not pass the test for crystal clear water. Keep at it for a few more days until you pass all 3 criteria.

 

[Krulligo]

Just cause I was/am going through something similar, are you sure its not just dead algae dust from your SLAM. I have a sand filter and supposedly its good to filter debris 20-40um in size, while dead algae dust is typically much smaller, so a lot of it will just pass through your sand filter and back into your pool. What I found is that if you only have a little bit of it left from your SLAM, you will not really see it if you brush the algae dust into suspension and water will look clear, but it will accumulate at liner wrinkles like that.

What would probably help is let it accumulate at the wrinkles, turn pump off for overnight, and then whatever you see on the floor, vacuum it to waste.

I also found that stacking 2 hair nets in the skimmer basket as filtered some of this algae dust off (the hairnet became green after 24 hours, and I replaced with fresh ones. This however involved me brushing the floor of the pool quite often, once every couple of hours during the day.

Other thing I tried to consider but not really have done is adding a bit of DE to the sand filter to filter out finer particles. Once again though, this will involve constant brushing to lift the algae dust back into suspension so it can pass through your filter.