RO system means Reverse Osmosis system. It takes out every type of impurity from the water. RO systems are normally used in places where TDS in water is very high. There are many RO systems available in the market which removes TDS from water but they take out essential minerals also. Aquafresh RO system purifies water but retain essential minerals making the water healthier. Moreover the after sale service and customer services are also the best in the market.