The Pulse Pod is easy for refilling. You just disassemble the mouth piece, open the red plug and fill it with the juice bottle. Mind that there should be now left liquid outside of the tank. A thin needle tip bottle will be a good choice for filling the tank. As coils may be burnt too much and thus influence the flavor, the heater in the pod also needs to be changed. How often you change the pod depends on your personal vaping habit. It’s the similar question to how long does a limitless pulse pod last, thus the answer is the same.