Well, a session of half an hour is found useful to inhale microscopic particles released in the air. Once inhaled, these salt particles are claimed to absorb irritants, including allergens and toxins, from the respiratory system. Always make sure, the salt room you are sitting in has 100% Natural Himalayan Salt and bought from a legit supplier. As we Being Himalayan Salt Bricks supplier always give certification of authenticity to our customers against their bulk purchase of Himalayan salt Bricks