DreamStation 2 Disposable Ultra-Fine Replacement Air Filters Sunset Sale! from $ 4.95 USD /per Product variants Two-Pack Qty. Add to Cart Couldn't load pickup availability Refresh A disposable, ultra-fine filter used in the new Phillips Respironics DreamStation 2 CPAP/BiPAP machines. Recommended to be replaced every 30 days. Replace sooner if discoloration is apparent.