S.C. Code § 15-35-830
Any person holding a lien by way of a judgment upon any property, the subject of taxation, upon which the judgment debtor shall have failed to pay the tax or upon which there may exist a lien for taxes on any other property of the judgment debtor may, at any time before the sale thereof for delinquent taxes, as provided in Title 12, pay the tax on all the property of the judgment debtor, with any costs, penalties or assessments which may have accrued thereon. And thereupon he shall be entitled, as against the judgment debtor, his representatives, privies or assigns, to include the amount so paid and all interest thereafter accruing thereon in the debt secured by such judgment. If a judgment creditor pay such taxes he shall have the first lien on the property subject to such tax to the extent of the taxes so paid with interest from the date of payment.
S.C. Code § 15-35-830