pool.jpgphoto 2.jpgphoto 1.jpgHello. I am a new pool owner (6 months) and have some white patches all around my pool walls. Half of these white patches allowed algae to grow underneath them, making scrubbing the algae off impossible. The patches will not scrape off with a 8" wire brush but will easily scrape off with a toothbrush sized wire brush. It looks like white cement paste/plaster or maybe large calcium deposits. "Cement leaching"? I could not find a similar photo matching or describing what I have anywhere on the internet.
I can scrape all of this stuff off but I dont want to be removing cement that's bonding the quartz pebbles to the wall or further damaging the pool.
Does anyone know what they are?
I'll post a picture