S.C. Code Ann. § 7-5-160

Effective July 1, 1976, any person who is registered to vote according to law shall remain permanently registered and entitled to all rights and privileges of such registration unless his name is removed from the registration list for cause. The provisions of this section shall not be construed to modify or repeal any of the provisions of this title or acts of the General Assembly which establish registration procedures and prescribe the causes for termination of registration or purging of registration rolls except those which require re-registration at ten-year intervals.