If you mean a standard barrel it is 55 gallons.
55 US gallons of water is 28,160 tablespoons
about 53 gallons
How much water do you take out of a 55 down to be 20%
55 US gallons = about 208.197 liters.
55 gallons x .2 = 11 gallons.
55 cubic feet is 411.429 gallons.
Since it takes about 1/2 an ounce for 30 gallons and 1 ounce for 60 gallons respectively, I would presume about 3/4 of an ounce for 55 Gallons of water...This is from a website I found to determine the same inquiry. There is some room for discussion, the total they give to start off with doesn't equal the end result they say is capable with 1 gallon of BLEACH. So...I would consult with someone at the Red Cross in your local area and they should be able to confirm these figures.
55 cubic meters = 14,529.463 gallons (US) 55 cubic feet = 411.43 gallons (US)
Er...55 gallons?
55 gallons?
55 gallons???