"top coil- obviously coil is on top. there will be long wicks dropping down into the juice.
bottom coil- coil is on the bottom. with very short wicks that you can barely see
since clearos work by absorbing juice through the wick into the coil, the position of the wicks/length of wicks can drastically change the performance. Get more information about which kinds of products are bottom coil and which are top coil clearomizer at: http://zgjyky.org/difference-in-top-coil-clearomizer-and-bottom-coil-clearomizer-clearomizer/"