|Allows:|| Farms +1|
According to the clergy, purity of spirit will shield you from all kinds of diseases and hardships. Personally, I believe purity of body might be a bit more crucial in this regard.--Renya Seen, Herbalist
For civilizations that prosper with additional population (for example, the Calabim), Sanitation is especially valuable in that all Farms gain extra food, and also unlocks the Public Baths, which allow an additional 3 population in the city it is built in.
This tech is one of the key lynchpins of the Aristograrian civic strategy.