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|style="width:50%;"|{{santable_new|
sys7=|
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pic=Fill_and_cover_arborloo.png|
ApplHousehold=XX|
Input1=Excreta|Input2=Faeces |Input3=Organics | Input4=Anal Cleansing Water |Input5=Dry Cleansing Materials|
Output1=Biomass |Output2= | Output3= | Output4= | Output5=
}}
|[[Image:Fill_and_cover_arborloo.png |right|300px500px]]
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'''To decommission a pit, it can simply be filled with soil and covered. Although there is no benefit, the full pit poses no immediate health risk and the contents will degrade naturally over time. Alternatively, the Arborloo is a shallow pit that is filled with excreta and soil/ash and then covered with soil; a tree planted on top of the nutrient-rich pit will grow vigorously.'''
When a [[Single Pit ]] (S.2) or a [[Single Ventilated Improved Pit|Single VIP ]] (S.3) is full and cannot be emptied, “fill and cover”, i.e., filling the remainder of the pit and covering it is an option, albeit one with limited benefits to the environment and the user. The Arborloo is a shallow pit on which a tree can be planted after it is full, while the superstructure, ring beam and slab are moved to a new pit. Before the Arborloo is used, a layer of leaves is put on the bottom of the empty pit. A cup of soil, ash or a mixture of the two should be dumped into the pit to cover excreta after each defecation. If they are available, leaves can also occasionally be added to improve the porosity and air content of the pile. When the pit is full (usually every 6 to 12 months), the top 15 cm is filled with soil and a tree is planted. Banana, papaya and guava trees (among many) have all proven to be successful.
===Design Considerations===
An Arborloo is only an option if the site is suitable for a tree to grow. Therefore, when selecting the pit location, users should already take the space and site conditions required for a new tree into account (e.g., distance to houses). A shallow pit, about 1 m deep, is needed for an Arborloo. It should not be lined as any lining would prevent the tree or plant from properly growing. A tree should not be planted, however, directly in the raw excreta. It should be planted in the soil on top of the pit, allowing its roots to penetrate the pit contents as it grows. It may be best to wait for the rainy season before planting it if water is scarce.
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===Appropriateness===
Filling and covering a pit is an adequate solution when emptying is not possible and when there is space to continuously dig new pits.
===References===
*Hebert, P. (2010). [https://www.crs.org/sites/default/files/tools-research/rapid-assessment-of-crs-experience-with-arborloos-in-east-africa.pdf Rapid Assessment of CRS Experience with Arborloos in East Africa]. Catholic Relief Service (CRS), Baltimore, US.:Available at: [http://www.susana.org/library susana.org/library]
* Morgan, P. R. (2004). [https://www.susana.org/en/knowledge-hub/resources-and-publications/library/details/986 An Ecological Approach to Sanitation in Africa. A Compilation of Experiences]. Aquamor, Harare, ZW. Chapter 10: The Usefulness of Urine.:Available at: www.ecosanres.org
* Morgan, P. R. (2007). [https://www.susana.org/en/knowledge-hub/resources-and-publications/library/details/195 Toilets That Make Compost. Low-Cost, Sanitary Toilets That Produce Valuable Compost for Crops in an African Context]. Stockholm Environment Institute, Stockholm, SE. pp. 81-90.:Available at: www.ecosanres.org
* Morgan, P. R. (2009). [https://www.susana.org/en/knowledge-hub/resources-and-publications/library/details/989 Ecological Toilets. Start Simple and Upgrade from Arborloo to VIP]. Stockholm Environment Institute, Stockholm, SE.:Available at: [http://www.ecosanres.org ecosanres.org]
* NWP (2006). [https://www.ircwash.org/resources/smart-sanitation-solutions-examples-innovative-low-cost-technologies-toilets-collection Smart Sanitation Solutions. Examples of Innovative, Low-Cost Technologies for Toilets, Collection, Transportation, Treatment and Use of Sanitation Products]. Netherlands Water Partnership, The Hague, NL. p. 51.:Available at: [http://www.ircwash.org ircwash.org]
===Acknowledgements===
{{:Acknowledgements Sanitation}}
