My CH was down to 120 so I added 50 pounds of calcium chloride and it only increased CH to 225 . Pool Math says 27 pounds should have done that. 50 pounds should have taken it over 300. I am pretty sure my pool volume can't be off that much. I did this with chlorine pretty high (near SLAM level) but I get the same test levels regardless of chlorine levels it drops. Can anyone tell me how this is possible? Thanks