i am having difficulty maintaining chlorine using Dichlor . 37500 gallon pool ..For multiple days I put in 32 oz of Dichlor and next day Chlorine reading 0 - 0.50 (taylor kit and pool store readings). Pool is crystal clear but essentially no Chlorine. my dealer said i had "chlorine lock" and had me put in a few gallons of shock.. no change.... thank you in advance for any suggestions!!

Temp 71
PH 7.6
FC 0
CC 0
ALK 150
CH 235
CYA 145