Why Is the Conch (Shankh) Blown During Puja?
The shankh is Vishnu's own emblem and it marks the opening of sacred time. But which conch is blown, which is worshipped, and why is it kept away from the Shivling? A plain answer, without invented science.
Almost every home puja reaches the same small moment of confusion. Someone picks up the shankh, someone else says "not in front of the Shivling," and a third person asks the question nobody quite answers: why do we blow it at all? Here is what the tradition actually says about the conch — and, just as usefully, where it stops saying anything.
Where the conch comes from: Panchajanya and the churning of the ocean
The shankh enters our tradition as a divine object long before it becomes a household one. In the opening chapter of the Bhagavad Gita, as the two armies face each other, Krishna sounds his conch Panchajanya — named there alongside Arjuna's Devadatta and Bhima's Paundra. In Vaishnava iconography, Vishnu holds the shankha in one hand along with the chakra, gada and padma. So when a conch is sounded in a Vishnu temple, it is not ornament; it is one of the Lord's own emblems being given voice.
The second story is the samudra manthan, the churning of the ocean, from which the shankha is said to have emerged along with Lakshmi, the Kaustubha gem, Airavata and the rest. It is worth being accurate here: the Puranas do not agree on one fixed list of what came out of that ocean, and the Bhagavata, Vishnu Purana and Mahabharata accounts differ in detail. What they share is the association of the conch with the same waters that brought forth Lakshmi — which is why, in most homes, the shankh sits on the altar as a Lakshmi-linked object and not merely as an instrument.
The sound: what tradition says, and what it doesn't
Tradition connects the conch's long, unbroken note with naad — sound understood as the very beginning of creation — and many teachers describe that note as resembling the pranava, Om. This is how it has been taught and understood for centuries. It is a devotional and philosophical reading of the sound, and it deserves to be presented as exactly that.
What the conch does very plainly is mark boundaries in time. It is blown to open the puja, again at the aarti, and once more to close. In a temple it tells everyone within earshot that worship has begun. Beyond the temple, how far the conch travels depends on where you are: in Bengal, Odisha, Assam and much of coastal India it marks a wedding or a griha-pravesh as well — often blown by the women of the household — while across much of North and West India it stays largely a puja and aarti instrument and plays no part in the wedding rites at all. At a Satyanarayan katha it is common more widely. Wherever it is sounded, it does the same work: it separates ordinary time from ritual time. That much needs no interpretation at all.
Dakshinavarti and vamavarti: two shells, two different jobs
Most confusion about the shankh disappears once you know there are two kinds, and that they are not interchangeable.
- Vamavarti shankh — the ordinary one, whose spiral turns to the left. This is the conch that is blown. Nearly every shankh sold in a bazaar and every one sounded at aarti is vamavarti.
- Dakshinavarti shankh — the rare right-turning shell, treated in tradition as a form of Lakshmi herself. It is kept on the altar, bathed, wrapped in cloth, and water is poured through it for abhishek. It is generally not blown at all. Genuine dakshinavarti shells are uncommon and expensive, and imitations are widely sold — buy one only from a seller you would trust with anything else costly.
The point most people get wrong: the shankh you worship is not the shankh you blow
This is the practical rule families actually live by, and it is rarely stated plainly. A conch kept on the altar as a deity — usually dakshinavarti, sometimes a vamavarti one that has been formally installed — is worshipped, offered water, and never put to anyone's lips. The conch used for sounding is a separate shell: it is blown, rinsed, kept clean, and kept apart from the worship shankh.
The reasoning is one of respect, not of danger. An object receiving worship is not simultaneously handled as a tool; a tool that passes from mouth to mouth is not placed among the objects being worshipped. Traditions vary in strictness here — some households keep only one conch on the altar and never sound it, others keep the blowing shankh in a separate cloth altogether, and many families do neither and manage perfectly well with one. If your family has followed a particular practice for generations, that practice is your answer.
The exception everyone asks about: shankh in Shiva puja
This is the most common question of all, and there is a specific story behind it. The Brahmavaivarta Purana tells of Shankhachuda, an asura who was a devotee of Vishnu and the husband of Tulsi. He was ultimately destroyed by Shiva. Because of his devotion, his remains are said to have become the conch shells — and so conch water is beloved of Vishnu and the Devi, but Shiva does not accept it. That same marriage to Tulsi is one of the reasons commonly given for withholding tulsi leaves from Shiva's worship; other texts tell that restriction instead through Vrinda and Jalandhara, a different story altogether. The narratives differ; the practice is the same.
Now the part that usually gets flattened in the retelling: what the restriction concerns is offering Shiva water from the shankh — the abhishek — not necessarily the sounding of the conch. Many Shiva temples, particularly in South India and in Shakta practice, blow the conch during aarti quite normally. Other households treat the shankh as best kept away from the Shivling altogether. Both practices are old, both are held sincerely, and neither community is doing it wrong. If you are unsure, the middle path most priests suggest is simple: offer Shiva his abhishek from a lota or a copper vessel, and follow your local temple's custom on the sounding.
What the shastras do not explain
You will hear a great deal about conch frequencies purifying the air, killing germs, or healing the body. None of that comes from the shastras, and we will not repeat it here. The texts give the conch a place in iconography, a place in the churning story, and a place in the sequence of ritual — they do not offer a physical mechanism, and they were never attempting to. Where a reason is genuinely unrecorded, saying so is more honest than inventing one.
What can be said is modest and true: the conch is Vishnu's emblem, it opens and closes worship, its sound is understood as naad, and generations have found that it settles a room and gathers everyone's attention at once. If you are fixing the day and the muhurta for a puja where the shankh will be sounded, the daily panchang will give you the tithi and timings to work with, and a family katha can always be arranged with a priest if no one at home is confident with the ritual order.
In short
The conch is blown because it is Vishnu's own emblem and because its sound marks the opening of sacred time; tradition links that sound to naad and to Om. Keep the two shells distinct — the dakshinavarti you worship, the vamavarti you sound. And in Shiva puja, the old restriction from the Shankhachuda story concerns offering water from the conch, while the sounding of it varies honestly from region to region.