The MCU Based Rainwater Tester-Purifier using Polyvinylidene Fluoride Ultrafiltration and Ultraviolet disinfection sterilizer process with GSM System is a device wherein rainwater from the roofs will be filtered into potable water. It can also detect if the rainwater is suitable for filtering that will turn into potable water. The MCU based rainwater tester is where we can measure the Total Dissolved Solids (TDS), wherein parts per million (PPM) is the unit being used for conductivity sensor. The Purifier using Polyvinylidene Fluoride Ultrafiltration process is a new technique for filtering the water into potable water. It is less maintenance and has a long range of lifespan. The GSM system will give you updates about TDS level.