Volume IV of the World Health

Volume IV of the World Health Origination (WHO) Guidelines for the safe use of wastewater, excreta and greywater addresses the reuse of all types of greywater (including kitchen greywater); however, it Furosemide does not specifically address greywater reuse for dishwashing, focusing instead on reuse in agriculture ( WHO, 2006). The WHO guidelines are based on a microbial risk assessment approach, recommending a maximum health burden that does not exceed 10− 4 to 10− 6 DALYs per person per year. NSF International (NSF) and the American National Standards Institute (ANSI) recently published international guidelines for water reuse. The NSF/ANSI Standard 350: On-site Residential and Commercial Water Reuse Treatment Systems and the NSF/ANSI Standard 350-1: On-site Residential and Commercial Greywater Treatment Systems for Subsurface Discharge provide guidance on water quality standards ( Table 2), methods of evaluation, product specifications, and product literature for greywater treatment systems. In addition to producing these guidelines, NSF and ANSI also certify treatment systems. While NSF/ANSI certification does not necessarily satisfy regulations in all countries or states, bark does provide a consistent standard that is recognized internationally.