The duration of the 55 gallon drum will depend on how many nozzles used, the amount of time the misting system is on and how many times a day it is used with the Pyranha SprayMaster Barn Misting System Kit. For example, if you are using the standard 8 nozzle kit, running at 190 psi, sprayed 45 seconds 5 times a day will last for approximately 26 weeks.

Here are the instructions per the Pyranha SprayMaster Barn Misting System Installation Guide:  Winterizing Your SprayMaster System 1. Disconnect the line at the elbow (next to pressure gauge) and open the bleed valve at the end. 2. Using an air compressor, blow liquid from the line until dry. 3. Lift the top and raise the intake filter out of the liquid; set timer switch to “ON” and run briefly to eliminate any liquid in the equipment. 4. If you do not have a compressor, keep line disconnected at elbow to empty the lines of as much liquid as possible. Leave intake line and filter separated from liquid. 5. If the insecticide liquid freezes during the winter, you will need to stir the contents before reusing. (Reconnecting System After Winterizing) 6. After stirring the contents of your barrel, replace the top of the system taking care not to crimp the intake line, return line or float line. 7. Open bleed valve and run system long enough to remove the air in the lines. 8. Check your timer to verify the time is correct and the settings are correct. 9. The system is now ready for use.