Took a day or so - dropped the total alkalinity to around 90 and got the hardness to around 220. Ph dropped when I did the alkalinity so had to re-adjust that. Chlorine was pretty much depleated at this point so I shocked with 6 gal CHlorine - free chlorine registered at about 1ppm while the total went very high. Pool store had same readings? I'm stumped! Is it safe to swim with high CC?