Wahaso - Organic rainwater Filtration System

For stormwater collected from parking lots and walkways, organic filtration can be both effective and relative inexpensive. Stormwater is diverted to a vegetated swale area where it collects and then drains to a subsurface cistern. The plants, sand and organic microbes living in the soil all serve to filter and break down contaminants in the water before it enters the cistern. Water in the cistern can then be used for irrigation between rain events. The swale must be sized appropriately to prevent flooding and will not work on properties struggling with heavy silt run-off.