I agree with Dan. You need to target 20, test 30 mins - 1 hour later and see how much you lose. I know with ammonia you will lose much faster, but the mor you stay on top of it, you will get ahead of the ammonia.
getting there. Lost 6 PPM last night. from 12 down to 6. CC are holding at a trace .5 or less. I put up to 20 this morning and will see how it goes. Question. At what FC level is it ok to swim? (The weather is going to be great tomorrow - I am hopeful).