Sodium Hypochloride (hypo) dangers?

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Someone was saying if hypo is mixed with something it makes a gas similar to the one used in first world war. I guess chlorine is gas is the one. Don't mix it with acid!

It kills plants. I was going to use it on sandstone. Drench the surrounding grass in water then pour it on slabs with watering can leave 30 mins to be absorbed by stone then spray with pressure washer from distance
 
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