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My free chlorine has been high almost all summer. I have been keeping the chlorinator at 1-2 and have still been shocking weekly, except I missed last week. Yesterday, the FC level was still high. I'm due to shock tonight, but not sure if I should. The water looks crystal clear.

Hi, I have a 3-4 year old Raypak gas heater which just got a new heat exchanger (PH was out of wack and caused massive corrosion). My pool repair person also installed a bypass so I can avoid water circulation through the heater when not in use. The bypass pipe itself does not have a shut off...