Basically RO is available in different categories but the major part of ro is its purify system. If its purify system is advance, it will give 100% clean water.
In my opinion kent RO system is best for home. We use Kent RO since July, 2016 , still it is running very well.
It is Kent superb RO+ UV+ UF+ TDS control water purifier. The process of purification is fast and simple. It has a digital indicator display which shows many features like control water purifier.
Its customer support service is great. You should purchase Kent RO.