Make sure to fully clean the mouthpiece before removing the filter screen. Use the G Pen Tool included to push against the filter holes of the screen, sliding it out of the small opening at the front of the mouthpiece.
If you have any further inquiries, please contact our Customer Service Department anytime Monday through Friday, 8:00am to 5:00pm PST.
Email: help@grencoscience.com
Phone: (800) 948-7480