A RCRA hazardous waste is a waste that either appears on one of three lists created by the U.S. Environmental Protection Agency, or, if not on the lists, exhibits one of four characteristics of hazardous waste.
How often should oxygen nasal cannulas be changed? Update: Our supplier recommended we change the cannulas monthly and the tubing every 60-90 days. My father has friends who's suppliers have had different guidelines.
Most Reverse Osmosis Filter Systems say that: 1  Pre and post filters should be changed every 6 to 12 months. 2  The membrane should be changed every 2-3 years OR if you notice a significant drop in water passing through the reverse osmosis system. The O-rings should be changed every other filter change on the pre and post filters and every change on the membrane.