The best place to install a rainwater filter is in the tank. Now there is no need for separate downpipe filters or separate filtration tanks. The PURAIN Rainwater filter itself can be directly used as an overflow and all roofing downpipes can be connected to one single filter. A lot of tank manufacturers and dealers are already providing PURAIN rainwater filters built-into their tanks. This makes installation of your Rainwater system quick, easy and as per the manufacturers recommendations. Due to its low height offset and its size the PURAIN rainwater filter can be retrofitted easily into most tanks. To follow are a few examples of the PURAIN rainwater filter integrated into various tanks: