“Super easy to refill one pod will last approximately a week depending how many times you refill it. But they are so cheap you get two for eight dollars so approximately four dollars a week to keep them replaced. And even cheaper if you don’t refill it once a day. It is only a 2.5 mL tank so it doesn’t hold a ton of juice which I kind of like because I can switch up the flavors frequently. But on the same hand if you refill it every day like me you only get about seven refills Before you have to discard the pod so I kind of wish you held a little bit more juice. But I definitely love the renova zero pod system”