You can always dilute it. Take a 5 gallon bucket and if you put 3 gallons of water in it, then add one gallon of 20%, you'll have 5%--same as laundry bleach--and the 4 gallons will be like adding 4 gallons of bleach.
But be very, very careful. 20% is tricky stuff, will burn you, burn through clothes and shoes in an instant. Even nominal 12% (tests at 14-14.5) can damage anything it touches. BTW, 1 ml of your chlorine in 10 liters of water is the same concentration as in a pool and allows you to measure its strength. (10 liters is 5 soda bottles).
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