I noticed that after vacuuming (4/5 hours) after I get this black stuff at the bottom of the pool. If I brush it it dissipates instantly. The walls feel clean and I have a nautilus cc that cleans the walls. My levels can be found with this link from today's most recent set of tests.
Could this just be black soot or pollen or something? Could it be algae? I lost .5 FC overnight (and that is with me testing after sunlight). I think my chlorine lose is minimal over the evening hours so I'm thinking it's not that's however, it just looks horrible. I removed the cover today... Maybe the buildup was from the cover and a good vacuum will make it all go away?
Could this just be black soot or pollen or something? Could it be algae? I lost .5 FC overnight (and that is with me testing after sunlight). I think my chlorine lose is minimal over the evening hours so I'm thinking it's not that's however, it just looks horrible. I removed the cover today... Maybe the buildup was from the cover and a good vacuum will make it all go away?