Rooftop rainwater can of good quality and may not require Treatment before consumption
Although some rooftop material may produce rainwater that is harmful to human health ,but it can be useful for flushing toilets,washing clothes ,watering the garden and washing cars
The first flush of rainwater after a dry season should be allowed to run to waste, as it will be contaminated with dust , bird dropping etc .
Rooftop rainwater is collected and stored in sump.