Always read the label and follow the directions for use. FESS Nasal & Sinus Wash Gentle Strength is a deep penetrating, preservative-free, non-medicated isotonic saline wash. The FESS Nasal & Sinus Wash Kit consists of pre-mixed dry powder sachets. When mixed with warm water, the contents of each sachet produce a 200mL saline wash. FESS Nasal & Sinus Wash Gentle Strength is a natural way to help relieve nasal and sinus congestion. Irrigating the nasal and sinus cavities with a large volume of saline solution helps wash away excess mucus and relieve congestion caused by colds, flu, sinusitis, hayfever, allergies, and nasal surgery. It is suitable for daily use and can be used during pregnancy and breastfeeding. FESS Nasal & Sinus Wash Gentle Strength is approved by the Sensitive Choice program in Australia and New Zealand.