Respironics REMstar Foam Filters, 2 per pk.

These are the reusable foam filters for the machines listed below.

This product includes:
• 2 x  Reusable Foam Filters

This product is compatible with:
• REMstar M Series
• All Respironics System One Series 
• Sleep Easy Ultra

Care Instructions: Rinse the pollen filter every two weeks or whenever you notice buildup. Replace every 3-6 months for optimal performance.