i just found some water conditioner in my shead and remberd hearing that it can be used for things other than cleaning water

it contains things like sodium chloride, magnesium sulphate, potassium chloride, potassium bromide, sodium thiosulphate
and a few others it is a yellowish coloured powder
what can i use this for?
if i wanted to use potassium chloride could i just use this stuff or would the other stuff interfear with what ever i make?