This bundle was created to assist Phillips Respironics Dreamstation CPAP & BIPAP Users to replace their supplies. Please note included in this bundle is the following: 1- 15MM Heated Tubing. This should be replaced every 3 months. 1- Water Tank (Please Note: This is the internal replacement water chamber only). This should be replaced every 6 months. 1- Reusable Pollen Filter. Remember to replace your reusable filters every 90 days for optimal use while avoiding debris buildup. 6- Disposable Ultra Fine Filters. Remember to replace your disposable CPAP Filters every 30 days for optimal use.