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Pre-treatment with interceptor tanks and a grease trap is essential. The homeowner must maintain the interceptor tanks and the grease trap. Ideally, households will also be responsible for the maintenance of the sewers, however in practice this may not be feasible. Alternatively, a private contractor or users committee can be hired to assume responsibility for the maintenance as inexperienced users may not detect problems before they become severe, and therefore, more costly to repair. A related problem is that households may drain stormwater into the sewer. This practice should be discouraged whenever possible. Blockages can usually be removed by opening the sewer and forcing a length of rigid wire through the sewer. Inspection chambers must be emptied periodically to prevent grit overflowing into the system.
==Acknowledgements=={{:Acknowledgements Sanitation}} ==References and external links==
* Azevedo Netto, MM. and Reid, R. (1992). Innovative and Low Cost Technologies Utilized in Sewerage. Technical Series No. 29, Environmental Health Program. Pan American Health Organization, Washington DC. (Refer to Chapters 3 and 4 for component diagrams and design formulae.)
* Watson, G. (1995). Good Sewers Cheap? Agency-Customer Interactions in Low-Cost Urban Sanitation in Brazil. The World Bank, Water and Sanitation Division, Washington, DC. (A summary of large scale projects in Brazil.)
==Acknowledgements==
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