" Put simply, I would say: "I want to get rid of that tick that is been biting me all day long." I would not say: "I must be free from that tick." And that is why I would use "rid of" with a chilly, as opposed to "free" (it https://www.reddit.com/user/ecograntscheme/comments/1fffzsl/4_steps_to_apply_for_government_grant_for_solar/