Distilled water 20ltr
Because distilledrnwater is so pure, it is arncommon tool used in the medical field
When using a CPAP/BIPAP/OXYGEN CONCENTRATOR humidifier it's important to only use distilled water. Even though tap water straightrnfrom the sink is probably more convenient for many CPAP usersrnto access. However, CPAP manufacturers and clinicians recommendrnthat patients only userndistilled water in theirrnhumidifier chambers for important reasons.
Filtered water mayrnremove some of the minerals but may not remove living organisms orrnother chemicals.