I'm a bit curious. We know that our levels of chlorine are determined by the amount of cyanuric acid in the pool and this also effects the amount of chlorine to use for an effective shock treatment. But when it comes to straight use of chlorine to break down chloramines is CYA a factor. If I wanted to add CL just to deal with chloramines to I need to be concerned with how high my CYA level is. Again, just curious. Can't think of a real scenario were I would want to deal with chloramines only.