Sutro (acq. Sani Marc) | 741 followers on LinkedIn. Love Your Pool (or Spa) Again. | Sutro has built an IoT solution for managing water quality, including a patent-pending sensor. Our users simply drop the Sutro device in a body of water to receive water quality information and management instructions. Because of our deep subject matter expertise, we’re initially launching into the domestic $13B market for residential swimming pools and spas, although we will ultimately impact the global $600B water market with our powerful product.