Fine Powdery Yellow/Light Brown Substance..Algae Problems
I have trouble keeping my in-ground pool clean. There is a very fine powdery yellow / light brown substance I can't vacuum out. Chlorine / pH levels are normal.
Pool is 5 years old
Thanks for your question Dieter
From your description it sounds like you might have a Yellow Algae problem, sometimes called Mustard Algae. This kind of swimming pool algae is normally found in the shady parts of the pool
If these yellow spots can easily be swept away into a powdery form, then re-appear a couple of days later, chances of having Yellow Algae is pretty high.
After you get this issue under control, go to this link to learn how to best balance your pool water:
I'd like to have your complete chemical readings, the actual numbers:
Chlorine, CYA (cyanuric acid/stabilizer), pH, Alkalinity, Calcium Hardness, and Metals (iron and copper) and names of any algaecides you may have used along with clarifiers, phosphate removers, and/or flocs. It makes troubleshooting much easier.
Have a great Summer.