Sewage Sedimentation

The chemical most commonly used to increase the speed of sedimentation of sewage is lime.

Here is a summary of the topic:

Sewage sedimentation is the process of separating solids from wastewater. Lime reacts with the organic matter in the sewage to form a precipitate, which settles to the bottom of the tank.

Here is the question:

What is the chemical most commonly used to increase the speed of sedimentation of sewage?

The answer is lime.