Roof Top RWH has been widely constructed under smart city Karim Nagar & has been successful under smart cites in other part of inda as well. InRain has it own Inhouse R&D team working for betterment of technology inching ahead. The rainwater harvesting systems and packages on this page contain everything you will need if you wish to install a rainwater harvesting system, including water butt, diverter, filter and pump. If you would prefer to buy each of these components separately, visit the corresponding pages in this section. For those new to the field, it may be easier to buy a package which includes all you need rather than having to decide on each component individually. Filtration is an integral part of rainwater harvesting systems. Filters typically remove contaminants such as dust, leaves, organic waste. Even if the water isn’t being used for drinking it is useful to remove these contaminants. In some systems a filter is placed in the the diverter, whilst in others it’s in the downpipe or in the water butt.