Due to the addition of chlorine and bromine found in swimming pools and spas, and the flow requirements on the pool/hot tub side, flat plate solar heat exchangers are not suitable. A special high-flow cell heat exchanger should be used. These heat exchangers can handle higher secondary side flows and high levels of chlorine, and have better flow characteristics, making them ideal for solar pool heating or solar hot tub heating. For applications that use salt water, we recommend using a SUS316 version of the solar pool heat exchanger. This version has high resistance to salt water and chlorine.