We just purchased a new house that has a pool. I've never had a pool before so I've been reading all I can about maintenance here on TFP.
I've managed to get my green swampy water to be crystal clear, but now I can see stuff stuck on the plaster (I'm guessing it's plaster, but I've heard/read something about it being gunite somewhere in the paperwork or discussions).
Here are a couple of pictures of the steps area of the pool. There's this stuff that to me looks like it could be algae or something, but I can't scrub it off even with a brush or my hands, so it makes me think the plaster could be damaged and that's just how the pool is?
On the blue tiles, it definitely looks like something stuck on there. On the deep end of the pool it looks like darker stuff stuck on the bottom, seems to congregate around the main drain on the bottom.