Need some help CYA high and New to testing

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Conducted Test 10

FC 18.5

Decided to jump in the pool and pull the light out and see if their was hidden Algae. Guess what - I found some thick Algae around the inside of the light and around the inside seal. I then took out the skimmer flaps and found a little stuck to the floats. All clean now.

I just did a test and FC is down

Test 11
FC 15

I hope I'm getting closer. Lets see after 1 hour.
 
Good job. You found the stuff that was consuming your chlorine. Light niches and ladders/steps nooks/crannies are notorious hiding spots because they don't get much flow at all. Keep maintaining your shock level until you pass all 3 criteria

1) Water is clear
2) CC .5 or less
3) OCLT of 1 or less

My guess is once you got that algae in the water and the chlorine can get to those areas you won't have long to go.
 

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