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.
1 Drain your spa water every 3 to 4 months, depending on use. If your spa has an ozonator, changing your spa water may only be necessary every 8 - 12 months.  Add 1/2 cup bleach to 3 gallons of water and sponge clean your spa shell. Rinse with fresh water and dry spa with large towels.