FC at 5, no CC's but CYA is not showing up. Thought I might have black algae on the 1st so added 2 gallons of bleach (12 1/2 %) daily and brushed for 2 days. Left town for 4 days had neighbor add 2 gallons a day until I got back. Back yesterday and CYA not showing, we had maybe an inch of rain but pool water isn't low. Do I just add more conditioner (CYA). The water looks OK and still gonna keep brushing for a few days but not sure of the Black Algae