The Spa Flow Switch is for pool/spa combo's and is plumbed into the spa suction line. When spa only mode is activated, the Spa Flow Switch is engaged. When connected with a Pool Lab Plus, Puresilk or Hayward PS Series chlorinator only this will turn off chlorine production to prevent over-chlorination in the spa.
When connected with a Pool Lab Plus and ASP, dosing rates will switch to match the programmed spa volume.

The product image shown is for illustration purpose only