The EvaRain Gutter System has the benefit of providing a first flush before the water enters the tank from your roof. By simply turning your filter to the ‘off’ position, the first rains can be manually directed outside of the tank, this ensures no small debris or leaves can enter your water tank. This system will collect up to 25,000L of extra water each year! (Depending on your average yearly rainfall) *This accessory is an optional accessory. If you would like a quote on this, please give us a call.