Does this look like black algae? A week ago, our swg timer malfunctioned so there were 2 days with no chlorine. I've noticed this brownish stuff on the floor but I thought it was dirt. I poured in some pool clarifier 2 days ago so that's why it's clumpy. I'm going to do the overnight fc loss test tonight.
fc: 7
cc: 0
tya: 50
cya: 0
fc: 7
cc: 0
tya: 50
cya: 0