"There is a risk of infection if the water is not sterile or the device is not cleaned after use. If the device is used improperly this can be harmful.[4] In fa

"There is a risk of infection if the water is not sterile or the device is not cleaned after use. If the device is used improperly this can be harmful.[4] In fact, proper application suggests the use of boiled water or saline water. In 2018, a patient was reported to have contracted Balamuthia mandrillaris after one month of using tap water filtered through a Brita water purifier for nasal irrigation.[5] Rare cases of fatal naegleriasis have occurred due to nasal insufflation of the amoeba Naegleria fowleri (the "brain-eating amoeba") from untreated tap water. In 2011, two people died from Naegleria fowleri infections tied to using Neti pots containing tap water.[6]" https://www.wikiwand.com/en/Nasal_irrigation https://www.wikiwand.com/en/Nasal_irrigation