★Air filter is very important for your breathing,it need to replace in every 3 Months.
★General replacement air filters for 1-6L old model DDT-1A/1B/1S/1LW series and 2-9L DDT-2A oxygen machines.
★How to clean the filter:You need to clean the machine’s filter once a month by removing the filter and dipping into a clean container filled with water and mild dish soap,scrub the filter with a wash cloth to remove any small pieces of dirt or dust and rinse it under water to remove all soap residues.Then set the filter on a clean,dry towel and let it air dry completely before putting it back in the machine.
★Please kindly check your model number and OD size of the filter before you will order.
1Pack X 4pcs replace air filters OD1.37INCH