further concentrates the residual material by absorbing the remaining water and electrolytes. Roughly 9 liters of water enter the small intestine daily (this fluid is a mix of ingested water and gastrointestinal secretions), where about 8 - 8.5 liters are absorbed. The remaining water is absorbed by the large intestine, with only around 100 ml being lost in the feces.

The main mechanism for intestinal water absorption is passive transport, where water flows from an area with lower solute concentration