philips respironics dreamstation cpap & bipap supplies bundle - includes heated tube (qty-1)/water tank (qty-1)/reusable dreamstation 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.