There are 11 different form of Rudra;
1. Mahadeva, 2. Shiva , 3. Maha Rudra, 4. Shankara, 5. Neelalohita, 6. Eshana Rudra,
7. Vijaya Rudra, 8. Bheema Rudra, 9. Devadeva,10. Bhavodbhava and 11. Adityatmaka Srirudra.
So there are 11 kalasa pots and 11 priests, and Rudram is recited 11 times and then the clay kalasa
pots are offered into the river where they slowly dissolve and the flowers float away.