Hello everyone! Just joined this group. Have been a pool owner for 25 years. We started out using a Carribean Clear System-then switched to Enjoy, currently using Chlorine.We have not had any issues with clear water but do have a stain situation. Our pool has patches of white bottom mainly the way the water flows to the main drain then we have some general yellowish brown patches some on bottom some on walls . I can’t seem to get anyone to identify and help remove. I have had suggestions of pumice stone, ascorbic acid or paint it. Just don’t know where to turn.