The saline shouldnt have any negative effects, but I am concerned about the sterility of the solution. I bet that the nasal solution isnt sterile enough to be injecting it. If its not sterile to the degree needed for injection you are risking getting an abcess, and you dont want one of those! I had a bad abcess and had to have out patient surgery for it, no fun. Now I am missing a small chunk of my ass.
Order bacteriostatic water online,this site has at least one sponser that carries that.