Sanitation and hygiene are the basic prerequisites for the development of any community. They ensure a healthy life for all, which in turn becomes a social and economic concern for increasing production and promoting good life. Though India is developing rapidly, we need to realize that it is unaffordable for us to ignore the concerns of maintaining sanitation and hygiene. Sanitation conditions are worsened due to a variety of factors in urban spaces such as improper disposal of domestic garbage, inappropriate disposal of industrial effluents, unsafe disposal of medical wastes, non-availability of defecating places for people staying in slums, paucity of sources of potable water for a large section of the population, especially those residing in slum areas. Out of which the major issue is the management of the faecal matter in a safe and hygienic manner.

Keystones main work on sanitation is done through the TNUSSP, which was launched in 2015. It is a consortium of organisations led by Indian Institute for Human Settlements (IIHS), and comprising Gramalaya, Keystone Foundation and CDD Society, which have been commissioned to implement the program via Technical Support Units (TSU) at the State and city levels.