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.
How often should a Tetra Whisper filter cartridge be changed? It's only being used with a 5 gallon tank, only one beta fish in the tank. The instructions say every four weeks, but I didn't know if you might be able to get away with changing it less often or if four weeks is a good time span.