Gheraṇḍa begins to detail the classifications of the ṣaṭkarmas. Dhauti, the internal cleansing, has two principal modalities. The distinction between internal and external refers to whether the cleansing is performed within the digestive tract or upon bodily surfaces.

Basti, the yogic enema, is also divided: jala basti (with water) and śuṣka basti or khecaryā (dry, using muscular contractions). This lesser-known variant in the West demonstrates the sophistication of the system: external means are not always required.

The systematic classification reflects the scientific attitude of these texts. They do not content themselves with vague descriptions; they categorize, subdivide, and specify.