Been real busy and have not had time to brush pool. Now form dirt and other organic matter blowing into the pool, I have black spots in the water, mainly on stairs, swim out and some spots on the floor. It's hard to brush off with a steel brush, especially on the grout lines. When brushed off, it's leaves a green spot. Is this algae?
Water has been balanced and real clear.
If it is, do I kill off with bleach or algae treatment?