Evaluation of a Medical Device Based on Isotonic Seawater and Hyaluronic Acid Used as a Nasal Spray

Inclusion Criteria: * IC1. Male, female over 6 years old. * IC2 Rhinoscopy score of at least 6, with a dryness symptom score of at least 2. * IC3. Have a smartphone that can use MILO application, for any patient that wishes to answer the questionnaires on their phone. * IC4. Patient and/or parent/legal guardian can understand and comply with protocol requirements and instructions. * IC5. Patient willing to not change their daily habits including but not limited to Smoking, use of fireplace candles, air conditioning, cold air, medication and dehumidifier. * IC6. Signed informed consent (by patient and/or parent/legal guardian). Exclusion Criteria: * EC1. Patients taking anticoagulants, over-the-counter or prescription systemic/topical corticosteroids, antibiotics, antihistamines, non-steroidal anti-inflammatory drugs (NSAIDs), leukotriene antagonists, topical or systemic decongestants or any treatment for relieve of nasal symptoms (except acetaminophen) in the two weeks prior to Visit 1 and during the study; * EC2. Patient with known hyper sensibility to the study treatment; * EC3. Patients using other nasal sprays, nasal pumps, nasal irrigation/washing devices or nasal oils, creams or gels in the two weeks prior to Visit 1 and during the study; * EC4. Patients with any dermatological, respiratory or medical condition (e.g., asthma, pneumonia, laryngotracheobronchitis, sinusitis, nasal polyposis and chronic sinusitis, urticaria or eczema) that, in the opinion of the princip…