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*Small / medium sized - Capacity: about 0.5-0.75 m3 - Filling time: 6-12 months
*10 users - Capacity: about 1 m3 - Filling time: 6 months
[[Image:Fossa_alterna.PNG|thumb|right|150px|[[Fossa alterna |Fossa alterna]], in Epworth (for credits, click the picture)]]
<li>In order to prevent water tables penetrating the pits and contaminating the water, pits should be shallow. </li>
<li>Applicable in rural and peri-urban areas, where compost can be taken away and disposed of or, better still, used on agricultural fields. </li>
<li>• As with many sanitation systems, household members need to understand the key principles for efficient operation and maintenance and discipline is required for adding soil after each defecation. </li>
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