Rainwater harvest and treatment system contribute to save environment and to supply non-portable purpose water for water insufficient areas.

Although roof-based systems generally produce water with low levels of chemical and biological contaminants, the water produced by both systems is subject to contamination and must be properly treated before it can be used. The level of treatment clients need to provide depends, to a great extent, on whether clients would use treated water for potable or non-potable purposes. (toilet flushing, clothes washing and watering)