CYA should be added very carefully, with a specific target in mind. You can only reduce CYA by replacing water, or performing RO on your water. Assuming you are not adding CYA as part of chlorination, in addition to the conditioner you have been using, it would be best to use the Pool Calculator with a full set of test numbers to make any further decisions about adding things to your pool. Also, CYA can take several days to show up in test results. A rule of thumb is to add 1/2 to 2/3 of the Pool Calculator recommendation, and wait seven days to test and add the rest if needed.