Newbie, I think I know the answer but....

[Watermom]

You can use liquid chlorine. Unless it is also 6% (and I doubt that it is), you'll use different amounts. Tell us the percent sodium hypochlorite and we can calculate a dosage for you. An easy rule of thumb that may help you judge is that in 10K gallons, the percentage of chlorine will add that amount of ppm to your water. Example -- in 10k gallons of water, a gallon of 6% will add 6ppm, 12.5% will add 12.5ppm, etc.