It depends on the congestion or any sinusitis like disorder. During normal health, you can use water equivalent to volume of two neti-pots. Empty one neti pot water from left nostril out of right nostril and next neti pot water from right nostril out of left nostril. During congestion, you can do jala - neti for two rounds. One round is pouring water in one nostril and flushing out through the other nostril with the help of neti pot and vice versa.
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