I currently have a CYA of 50 so my FC needs to be between 4 and 8 with a target of 6. The K1000 test only goes to 5. I was wondering what anyone is doing to test for an FC of 6 besides using the true test for FC. It would be awesome if I could just use the K1000 kit to test the FC and pH each day and then do the "real" test once or twice a week.