Greywater is a type of relatively clean wastewater that comes from showers, baths, sinks, and laundry facilities. Pollution of concern includes both nutrients from detergents as well as residual contaminants from personal care products. Natural systems technologies such as constructed wetlands can be applied to address and treat these pollutants to produce clean water for reuse or recharge back into the ground. For indoor reuse projects, additional treatment may be required to meet regulatory codes. However, when reused for irrigation, the natural greywater treatment system can often be simply designed and landscaped to match the aesthetic of the overall sites, while serving as functional gardens.