Abstract: An automated chemical feeder system maintains sanitizer concentration and pH in a body of water, such as a pool, spa, water feature, or other such body of water, at desired levels. A manifold includes a plurality of inlets, each of which receives the addition of a different chemical product to be added to the pool water. The system connects to the pool circulation system via two injection ports; a pool water sample port and a pool return port. Because the system requires only two injection ports into the pool circulation system, the ease of installation of system may be increased and the time required to install the system may be reduced. In another example, an automated chemical feeder system is adapted to maintain sanitizer concentration and pH in two bodies of water.