I managed to get 12% bleach from a chemical store.
Thank you guys, it is so much better to use than powder type chlorine.
It cost me like US$7 per 6.6 gallons jerry can if not 5.3 gallons can. I can't remember the detail.
My staff bough them for me. I am very happy, it make my pool less cloudy when I need to raise the CL without putting CYA.
Thanks again....Yipeee !!!!