About

Flow-Know

Flow-Know is a collection of sensors, instruments and cloud software services providing real-time access to your water usage and flow data.


Turn on the water (faucet, hose, vertical wall garden, multi-tenant property, etc) and watch the flow and usage data on your favorite device.


Gray Line Systems, LLC

Gray Line Systems (GLS) is a software and electronics design firm specializing in the development of water saving technologies like Flow-Know.