Well its been 8 days since we did the partial drain and the shock using bleach to above 20ppm . The water has remained excellent and the grandchildren were here for weekend and enjoyed three days of swimming .I am losing about 2-3 ppm per day of FC as each day need to add roughly 1 gal of bleach (6%). Is this normal ? Weather was actually more overcast than sun . I have been able to hold between 5 ppm and 9ppm by moring add of bleach.My new readings Sat were as follow
My cya appeared to increase to 80 which I was suyrprised as no tabs are bing used and teh chlorinator is actually turned off
PH is 7.8
FC was 5.6 and CC was o
Alk was 150
Hardness was 170

Have not added anything other then bleach