I have had this device for two days. I cleaned it out after 1 use,and when I put it back together the glass cracked in a perfect straight line from top to bottom. So now I ordered 2 replacement glasses for it. I guess they knew the glass was fragile , thats why they came out with the replacement tubes so quickly. So be warned the glass is very fragile. I am glad I have 3 original protanks for backup.