Abstract: A scraper assembly configured to traverse an exterior surface of a tubular member is disclosed. The scraper assembly includes a casing constructed and arranged to drive the scraper assembly to traverse the exterior surface of the tubular member and a primary ring fixed to the casing, having a plurality of projections formed of a semi-rigid material extending inward toward the exterior surface of the tubular member. A water treatment system including the scraper assembly is also disclosed. A method of retrofitting a water treatment system including providing the scraper assembly is also disclosed. A method of removing organic material fouling from an exterior surface of a quartz sleeve is also disclosed. The method includes directing the scraper assembly to traverse the exterior surface of the quartz sleeve.