The classical purification therapies are not a menu you choose from by preference. Each is matched to a dosha and to the season in which that dosha breaks out. Kapha aggravates in spring, so spring is vamana. Pitta aggravates in autumn, so autumn is virechana. Vata aggravates in the rains — so Varsha is basti season.
Charaka's estimate of basti is startling: he treats it as roughly half of all therapy, and some passages go further and call it the whole of it. The reasoning is anatomical in the tradition's own terms. The colon is the seat of Vata. Vata drives the other two doshas — Pitta and Kapha do not move on their own — so a therapy that reaches Vata at its own seat reaches, indirectly, almost everything.
What this newsletter is not doing is telling you to arrange one. Basti is a clinical procedure, it needs assessment and preparation, and it is not something to improvise from an email. If you have a practitioner, this is the fortnight to ask; if you do not, the useful part is the principle rather than the procedure.
The household-scale version of the same principle: this fortnight, look after the lower body and the colon. Abhyanga with warm sesame oil, with real attention to the lower back, hips and feet — Vata's territory. Regularity of elimination, which the texts treat as a daily observance rather than a private matter. Warm oily food in small quantities, so nothing dries. Gentle hip and low-back work rather than strong practice. Castor oil has a classical place here and a specific one — it is worth asking about rather than experimenting with.
One caution the tradition itself gives: this is not the season for aggressive detox of any kind. Agni is at its weakest. Purification asks for reserves you do not currently have.