The best replacement for chlorine gas is sodium hypochlorite.

The best alternatives to chlorine gas are rated as following:

★★★★★	sodium hypochlorite
★★	liquid chlorine
★★	mustard gas
★	hypochlorite
	chlorine dioxide

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Speaking about chlorine gas, one probably shouldn't forget about sodium bromide.

Other search terms related to chlorine gas and their ratings are:

★★★★★	sodium bromide
★★★★	potassium bromide
★★★	solid phosphorus
★★★	potassium iodide
★★	bromide ions
★★	sodium iodide
★	aqueous bromide ions
	potassium hydroxide

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Google Trends

Scale is based on the average worldwide traffic of chlorine gas in all years. Click on graph for more.

chlorine gas

sodium hypochlorite

liquid chlorine