The કેતુ beeja mantra is "ૐ સ્રાં સ્રીં સ્રૌં સઃ કેતવે નમઃ". The classical count is 17,000 repetitions, built up over weeks from one mala of 108 a day, and મંગલવાર is its day.
Mantra is the safest of the classical remedies: it can be started today, costs nothing, and cannot be worn against the chart the way a stone can. The Sankhya — the prescribed number of repetitions — is completed over weeks, beginning with one mala of 108 a day and building up. Sincerity matters more than arithmetic.
The Ketu mantra is chanted on Tuesday; Ganesha worship is the most-prescribed Ketu practice, and Bhairava worship the most intense.
An afflicted Ketu reads as sudden loss of interest, confusion about direction, and withdrawal from what one had built. Ganesha and Bhairava worship, feeding dogs, and steady practice are the classical response.
The classical Sankhya is 17,000 repetitions, completed over weeks rather than at once. Begin with one mala — 108 — a day and build up; sincerity matters more than arithmetic.
મંગલવાર. Fasting, charity and mantra japa for કેતુ all belong to that day.
The mantra, the weekday fast and the charity are safe for anyone — they address કેતુ without amplifying it. લહસુનિયા is not: a planetary gem strengthens whatever the graha is already doing, so it needs a chart reading first.