Hello all. Still relatively new to all of this. 26K Gallon, SWG, in-ground plaster pool.
Starting 3rd season and first year where I'm just having someone help me with opening and closing and I'm taking on the in-between.
Been trying to work on a greenish/yellowish irregular band about 4-5 inches wide that had formed just below the tile line and above the lowered water level from last years closing. I also had some brownish stains on horizontal surfaces like steps and swim outs (that were exposed to air during the off season). Bottom and rest of walls are good. In general, any area that remained above water had some sort of staining issue and anything water covered was fine.
I've been attacking the brown stains with a wire brush and I'm making good headway. But the ring is giving me fits. When I brush it (with the wire brush), it temporarily turns the water cloudy right in the area I'm brushing, but the brushing doesn't necessarily remove the stain. And the clouding disappears right after I stop brushing. So, I'm not sure if I'm just scraping plaster or if I'm actually removing dead algae and that's what's clouding the water.
Overall, the water is crystal, picture perfect clear and, using a DPD kit, it shows no CC (standard 10ml test). FC is holding at around 4/5 (keeping SWG at higher output for now). So, not really sure how to best attack the stains?