I brought the pool up to shock level 2 days ago. My FCL is now at 8.3. That was 5 minutes ago. While looking at the heater manual for closing instructions I noticed it highlighted in bold that chlorine should be maintained at no more than 5 ppm. I read that imbalances in alkalinity and especially PH can be adverse to your heater, but never anything about chlorine. It's a Raypak gas heater. Should I be concerned?