Yes, backflow preventers can be used in conjunction with other water treatment devices, such as water softeners, filters, and UV disinfection systems. In fact, backflow preventers are often used as part of a comprehensive water treatment system to ensure the quality and safety of the water supply. When selecting a backflow preventer for use with other water treatment devices, it is essential to consider the compatibility of the devices and ensure that they do not interfere with each other’s operation.