Chlorine gas is generated when chlorine bleach is mixed with sodium bisulfate (Sani-Flush). Pour a can of Sani-Flush in a baking pan, and level off the top of the pile. Punch a hole near Che bottom of the plastic bleach jug and place the jug in the center of the pan. A steady cloud of gas will be generated, the actual duration depending upon the rate of bleach flow. If it is necessary to direct the gas to a specific area, the generator can be covered with an airtight top fitted with a hose.
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