Just to follow up.. Should the FC have dropped that much in a week? Last Sunday it was 30

Pool looks as clear as it did last Sunday.. Cell controller is at about 75. Salt reads 2900 corrected to below recording from Leslies

2017-05-20 -- 1200
- FC: 10 -> I think they only read to 10 -- I tested it twice and came to 17 both times
- Salt: 3500
- Calcium: 300
- CYA: 80
- pH: 7.4
 
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