* Where septic tanks already exist, the cost reduction can be 40%70% (USA).
=== Applying conditions ===
<ul>
<li>The system can be appropriate in high- and low-density areas. </li>
=== External links ===
* General information about Settled sewarage [http://wwwwedc.ircwashlboro.org/ ircwashac.orguk General information].* General information [http://www.efmircwash.leeds.ac.ukorg/sites/default/CIVEfiles/824-ZACA97-14245.pdf Settled Sewerage ], IRC.* [http://wwwwashdev.efmiwaponline.leeds.ac.ukcom/content/3/CIVE2/Sewerage 230 Challenges facing sanitation-provision partnerships for informal settlements: a South African case study].* General information [http://wedc.lborowww.acsciencedirect.uk http:com/science/article/pii/wedc.lboro.acS0197397510000755 The PAQPUD settled sewerage project (Dakar, Senegal): Problems arising, lessons learned].uk ]