Water for domestic use is prone to contain harmful micro-organism. To eliminate them, chlorine is added at a suitable concentration. A drop in the concentration level below the approved level risks the water being unhealthy for consumption. We at Upande have done extensive research and developed an online chlorine water sensor that detects in real time the chlorine levels to ensure it is within the approved concentration. Emails and messages alerts are sent in case the level of chlorine is below or above the threshold.