Battling yellow algae (I think)

[easy-e]

Hi all

After a trouble free (TM) first season with my pool, I made the mistake of going away for 2 weeks and trusting chlorine management to a family member. Despite what I thought were very clear instructions , I returned home to find that only about 3.5 gallons of chlorine had been used in that time, which is waaaay low for a sunny 2 weeks.

See pictures for current condition of pool. Based on the amount of fresh 12.5% chlorine I added last night and this mornings FC on DPD test it seems like algae but wanted to run it by the experts to be sure.

Currently maintaining appropriate FC level for my CYA, running pump 24/7 and running Dolphin frequently but nothing is getting the yellow Darn off yet, even direct scrubbing. Worth mentioning it’s an older plaster pool and has some rough patches, I suspect this has allowed the algae to grab hold.

Ughhhhhhh

 

[Donldson]

Looks like normal green algae (green on a blue background tends to look yellow) and maybe some organic staining. Mustard algae puffs up when brushed.

Performing the SLAM Process and continuing to brush and run your Dolphin while at SLAM FC level should take care of it.

 

[easy-e]

Looks like normal green algae (green on a blue background tends to look yellow) and maybe some organic staining. Mustard algae puffs up when brushed.

Performing the SLAM Process and continuing to brush and run your Dolphin while at SLAM FC level should take care of it.

Thank you for the response. It’s a white plaster with some blue tile, pool generally has a very nice aquamarine color so what you said makes sense.

Will keep at the SLAM. This was a lot easier to do when I opened the pool in April vs a beautiful summer day.

 

[easy-e]

Clear water, no CCs but failed OCLT with a 2 FC drop. Still at SLAM level. Overcast day here so I added extra this morning and ran the robot again.

Should I be manually brushing or is the s200 robot enough to get through whatever “film” the algae has formed?

 

[duraleigh]

Brush. The robot alone is helpful but not enough.

 

[easy-e]

Brush. The robot alone is helpful but not enough.

Will do, thanks.