No, not really, since what you have is already a chlorine pool--the only issue would be whether there's already enough copper in your pool to create a problem, and you won't really know that until you shock the pool. Several of our forum members were prior N2 users and just leave the system in place but without the mineral cartridges. Have there been any reports of hair or nails turning green after swimming in your pool? Can you shock your pool without the water turning clear but greenish?