**Direct answer:** Backflow preventer installation adds a device that helps protect potable water from contamination caused by reverse flow. It’s commonly required for commercial properties, irrigation, and certain equipment connections, and it should be installed in an accessible location for testing and maintenance. If you need **Backflow Preventer Installation** in Toronto & the GTA, we’ll start by confirming the real cause, then walk you through the most practical options (quick fix vs long-term fix). To book service, call **647-784-8448** or email **[email protected]**.