Every person who shall be confined in any jail of this commonwealth, in execution or otherwise, for any debt, sum of money, fine or forfeiture, not exceeding in amount the sum of fifteen dollars, exclusive of costs, and who shall have remained so confined for the space of thirty days, shall be discharged from such confinement, if there be no other cause of confinement, and shall not be liable to imprisonment again for the same cause: Provided, That the estate and effects of such person shall, notwithstanding such discharge, be liable for such debt, or other cause of imprisonment, in like manner as before.
39 P.S. § 325