From the item description:

"In a brazier or firesafe pot, light an incense charcoal. When it is white hot, place a little bit of crushed or powdered asafoetida onto the coal. The smoke will purify the area." https://shop.glorian.org/collections/cleansing-incense/products/asafoetida-resin



Use incense charcoal like this: https://shop.glorian.org/collections/cleansing-incense/products/incense-charcoal-for-burning-resin-incense