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hi I am wondering what this is.. is it black algae. Doesn’t come off easily at all.. I use the steel brush and changes slight colour from black to greenish… used the puck and brush and puck and brush.. and no change. Currently slamming the pool as it’s gone cloudy. Went cloudy as fc dropped...

Hi I have a just slammed the pool after our old pump failed (which is now replaced). Pool is looking good and has passed the slam. Having inspected the tile waterline a few areas are 'discolored' with slight blackish / grey marks. I have used a stainless wire brush during the slam process but...