Disc Wicking System - 4 packThe UrbiPod's Disc wicking system works like magic drawing water from the UrbiPod base into the growing Pod's reservoir and then into the coir to keep the plant irrigated. No pumps. No gadgets. No electricity. Just physics. If you need extra or replacement parts you can purchase just the wicking system for each pod: comprising: the circle disc that sits inside the individual Pod the long wick (draws water from the base reservoir up into the Pod) the