#1 my pool is fiberglass. I have been adding 7oz of acid every other day to keep my Ph at 7.5 but in the last week it has been stuck at 7.6 so I just leave it there. I assume thats dut to the lower TA. My SWG is off and I have had to add very little bleach to maintain 5ppm FC. Air temps have been below freezing here for most of the last 6 weeks so I have had a fountain and pool pump running 24/7. Water temps for the last 6 weeks have been between 37 - 45. I did test the CH last night right out of the 41F pool.

Donnie