There are different kinds of CC and they are not all irritating. Municipal water supplies are now often chloraminated so have monochloramine at around 1 ppm which measures as CC but is not irritating. However, in a pool with chlorine that kind of CC won't persist and should get oxidized within hours. If the CC were a chlorourea, this too would not be irritating and would be fairly persistent. This is sometimes seen in indoor pools. It usually isn't seen much in outdoor pools exposed to sunlight because the UV in sunlight reacts with chlorine to create hydroxyl radicals which are powerful oxidizers. If you are not exposing your pool to sunlight, say because you are using a dark or mostly opaque cover, I suggest you uncover the pool and see if exposure to sunlight helps.