How often do I change the water bag on my Qufora® IrriSedo Cone/Balloon/Klick system?

The water bag should be changed every 30 days for Qufora IrriSedo Cone system (if on Balloon or Klick this should be 15 days) to prevent any mould or moisture occurring inside of the bag. To prevent this from happening the bag should be hung up out of direct sunlight with the cap left off and ensure the purple valve is left open after irrigation process to allow air to flow through the system.