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Fact #1. The earliest record comes from the ancient Hindu practice of Ayurveda. The roots of this can be traced back to the Hindu Vedic texts. It was a part of the daily cleansing ritual of Vedic scholars. A simple form of it is a step in the cleansing process for Muslims as well.
Fact #2. The first mass produced option was introduced in 1972. A Swami wanted his Western students to benefit from cleansing the body for meditation and pranayama. It was believed that clear breathing led to clear thinking. By purifying the nose, one could purify the thoughts and reach a higher level of meditation. Their popularity was cemented in the West after being featured on popular talk shows.
Fact #3. The act involves the introduction of a simple saline solution into the nasal cavity through one of the nostrils. The solution then travels through the sinuses, picking up bacteria and contaminants as it goes. The solution then exits the opposite nostril, leaving the sinuses clear and disinfected.
Fact #4. The goal is to clean out the entire nose, mucous membranes, and sinuses. Not all techniques can achieve this comfortably. Doctors have been studying the best method for successful irrigation of the entire sinus system. Some methods show success at entering the nose but are forced back out by gravity before reaching the sinuses. Positive pressure provided by these systems works best, and delivers solution to the forehead and cheek sinuses.
Fact #5. The volume of liquid to be delivered is something to consider. Studies have shown that high volume is the most effective at distributing saline solution to the entire system. This can be achieved by purchasing a large volume model. Or you can simply use a low volume system multiple times.