Benefits of using sea salt for cesspools and sewers Breaking down fats and limescale: Coarse salt helps to erode limescale and fatty deposits stuck to the pipe walls, especially when mixed with hot water. Removing unpleasant odors: Salt absorbs moisture and eliminates odor-causing bacteria within drainage systems. Improving absorption in cesspools: It is recommended to place salt with charcoal on the floor of cesspools (especially in rocky soil) to help open soil pores and improve water drainage. Safe method: It is considered a natural alternative and less harmful to pipes compared to corrosive chemicals in cases of simple blockages.