S.C. Code Ann. § 11-15-480: Redemption privilege.

All refunding bonds maturing subsequent to fifteen years from their date shall be subject to redemption not later than fifteen years from their date and on all subsequent interest payment dates prior to their respective maturities. Bonds may be issued with a provision permitting their redemption on any interest payment date prior to their respective maturities. Bonds made subject to redemption prior to their stated maturities may contain a provision requiring the issuer to pay a premium for the privilege of exercising the right of redemption in such amount as the governing body shall have prescribed in the proceedings taken to authorize the issuance of such bonds. All bonds that are subject to redemption shall contain a statement to that effect on the face of each bond. In the proceedings authorizing the issuance of such bonds provision shall be made specifying the manner of call and the notice thereof that must be given.