We had a FC reading of 2 and a CC reading of 3 on a 100,000 indoor pool with a great ventilation system. Yesterday, we added 10lbs of cal-hypo as we attempted to raise the FC to 10 to break point chlorinate and only reached a 7.5 today with CC of 1.75 after 22 hours. We cannot use CYA and never have. We shock at most annually, sometimes less for CC alone. Water is always clear as glass.
We could add 4-5lbs more to reach the original goal of 10 FC, but will that help achieve the goal of 0 CC at this point? - I don't need to pool this week, but it's in use on the 15th.