The screens are a great convenience for me. I used the CU without a screen and ate the Scooby Doo doos

These screens last a long time, I clean them with hot water with my cooling unit. Instead of buying these screens you can buy the Gasket Kit. It’s only ten bucks and it has three replacement screens for your vape. I decided to buy a few screens and a gasket kit, this way when I loose or break a seal I can still use my might.