so, i was just out doing my weekly maintenance, and as i was vacuuming the spa with my little hose vac i noticed there were black spots on the floor that aren't coming off. got out my bigger brush, thinking it was just some crud from the recent wind storms we've had that was stuck on...nope, still won't come off.
any ideas? i can't even fathom this being black algae, because my chlorine levels have been fine even throughout winter...i add liquid chlorine (10% from lowes), usually on...
black spots on bottom of attached spa...black algae?
any ideas? i can't even fathom this being black algae, because my chlorine levels have been fine even throughout winter...i add liquid chlorine (10% from lowes), usually on...
black spots on bottom of attached spa...black algae?
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