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{|width="100%"
|style="width:50%;"|{{santable_new|
sys7=|
sys8=|
sys9=|
pic=Double_ventilated_improved_pit.png|
ApplHousehold=XX|
ManShared=XX|
ManPublic=X|
Input1=Excreta|Input2=Faeces |Input3=Anal cleansing waterCleansing Water| Input4= Dry Cleansing Materials |Input5=|Output1=Compost - EcoHumusPit Humus| Output2= | Output3= | Output4= | Output5=|english_link=Double_Ventilated_Improved_Pit|french_link=Latrine_améliorée_à_double_fosses_ventilées|spanish_link=Pozos_Doble_Mejorado_Ventilado
}}
|[[Image:Double_ventilated_improved_pit.png |right|300px500px]]
|}
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[[Image:Icon_double_ventilated_improved_pit.png |right|80px]]
'''The Double VIP (S.4) has almost the same design as the [[Single Ventilated Improved Pit|Single VIP]] (S.3) with the added advantage of a second pit that allows the technology to be used continuously and allows for safer and easier emptying.'''
By using two pits, one pit can be used while the contents of the second pit rests, drains, reduces in volume, and degrades. When the second pit is almost full (the excreta is 50cm from the top of the pit), it is covered, and the contents of the first pit are removed. Due to the extended resting time (at least 1 year of filling/resting) the material within the pit should be sanitized and humus-like. The Double VIP is similar to the [[Fossa Alterna]] technology with the exception that the Fossa Alterna is specifically designed to produce humus and as such, it requires regular additions of soil, ash and/or leaves.
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===References===
* ARGOSS (2001). [http://www.susana.org/_resources/documents/default/2-1926-argoss-manual.pdf Guidelines for Assessing the Risk to Groundwater from on-Site Sanitation]. British Geological Survey Commissioned Report, CR/01/142, Keyworth, UK. Available at: www.bgs.ac.uk * Franceys, R., Pickford, J. and Reed, R. (1992). [https://www.susana.org/_resources/documents/default/2-1651-who-a-guide-to-the-development-of-on-site-sanitation.pdf A Guide to the Development of on-Site Sanitation]. WHO, Geneva, CH.Available at: www.susana.org/library* Graham, J. P. and Polizzotto, M. L. (2013). [https://pubmed.ncbi.nlm.nih.gov/23518813/ Pit Latrines and Their Impacts on Groundwater Quality: A Systematic Review].Environmental Health Perspectives, National Institute of Environmental Health Sciences, Research Triangle Park, US.Available at: www.ehponline.org* Mara, D. D. (1984). [https://www.pseau.org/outils/ouvrages/world_bank_the_design_of_ventilated_lmproved_pit_latrines_1984.pdf The Design of Ventilated Improved Pit Latrines]. UNDP Interregional Project INT/81/047, The World Bank and UNDP, Washington, D.C., US. Available at: documents.worldbank.org/curated/en/home (A good reference for detailed double VIP design information) * Mara, D. D. (1996). Low-Cost Urban Sanitation. Wiley, Chichester, UK. (Book; General description of VIPs with a focus on the ventilation system) * Morgan, P. R. (2009). [http://www.ecosanres.org/pdf_files/EcologicalToilets-PeterMorgan-Mar2009.pdf Ecological Toilets. Start Simple and Upgrade from Arborloo to VIP]. Stockholm EnvironmentInstitute, Stockholm, SE. Available at: www.ecosanres.org
===Acknowledgements===
{{:Acknowledgements Sanitation}}
