The duties of a swimming pool technician are to install, service, and repair swimming pool equipment, such as water filters, pumps, and water systems. Other responsibilities include mixing chemicals, testing the water, and maintaining the appropriate balance of chlorine and pH in the water. As part of their routine maintenance services, a pool technician may clean the pool and the surrounding area. Some technicians work at a single location, such as a large aquatics center where they are on-call, while others work independently or for pool servicing companies who service a range of commercial and residential clients.