<https://www.recreonics.com/product-category/maintenance-accessories/measurement-and-control/water-flow-switches/#webpage>
<http://schema.org/description>
"Water flow control regulators and switches regulate and monitor swimming pool water flow through the pump and can signal to shut off the pump if needed."
<https://www.recreonics.com/product-category/maintenance-accessories/measurement-and-control/water-flow-switches/>