You should be able to wash the filler and press it into some paper towel to dry. Same with the plastic housings. Just some warm water and dry well. Then re-use. If not changing flavors, just drip some more e-juice into the carts and re-use. Should last damn near forever. Problem is you only get ~30 puffs before you notice a loss of liquid and have to add more. At least I do. Carts are still the cheapest way to vape as long as you refil and don't toss. People are quick to dis 'em but having several full carts around means you can plug n play in a jiffy and just add more juice when you get home.