This is the replacement filter set used on VARON Serene 5 Oxygen Concentrator. Each set includes 3 pairs of different filters designed for separate parts of the machine. Both filters should be replaced after 300 hours of use to maintain optimal performance and hygiene.

Please note: 

• The accessories may be shipped separately from the oxygen concentrator, which will take 10-15 working days to deliver. The oxygen concentrators are usually shipped in 2-3 days after placing the order, and will arrive in about 3-5 working days.
• The 30-day Return & Refund policy does not apply to this accessory product. Please read the description carefully or contact our Customers Service Team for more information.