Can I use sea water to make salt water toffee?

purplepoppy
I was thinking of making some toffee at Christmas because it's a old tradition here to make it on Christmas Eve. Now I like salted caramel and I know Americans do a saltwater taffy. So I thought why not go one better and do a sea water toffee?

Obviously, I'm going to filter it through muslin to get rid of any shrimps that might be lurking but I was wondering do I need to dilute it down or do I keep it full strength?
Can I use sea water to make salt water toffee?
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