Assessement of Effectiveness of Seawater Nasal Sprays on Sinonasal Symptoms

Inclusion criteria: * Subject's age and medical condition in compliance with the intended use and population * Subjects who, from the investigator's judgement, should benefit from nasal wash in accordance with routine medical practice * Subjects with at least two nasal symptoms of intensity ≥ 3 (6 modalities intensity SNOT-22 rating-scale) among the following: * Nasal blockage/nasal congestion/ stuffy nose; * Runny nose; * Need to blow/clear the nose; * Sneezing; * Thick nasal discharge/secretions; * Decreased sense of smell /taste (replaced by "noisy breathing/mouth breathing" for infants) * Subjects with impaired nasal breathing (score ≥ 3, 6-modalities intensity rating-scale), induced by the presence of nasal symptoms * For acute indications (only): subjects with symptoms started not later than 72 hours prior to enrolment (Day 0). * For allergic rhinitis indication: perennial allergic rhinitis with and without seasonal allergic rhinitis * For post-surgery indication: septoplasty and rhinoseptoplasty. * Subject/parent willing to perform nasal wash following advices received from HCPs. * Subjects (or parents for babies and children) agreeing to follow the study requirements during the whole study period (up to 3 months). * Subject (or parent for baby and children) able to understand verbal and written local language and in capacity to fill-in questionnaire by himself. * Subject having daily access to internet to answer online questionnaire. * Subject or Parent/…