A couple weeks ago I was at a family function, and a few people asked about my e cig. So I started informing about the various things out there. Clearos came up, and well I never tried one. When I got my order today I realized I have no clue about filling this. Is it like filling my tanks? My biggest question : the rubber thing on the inside....do I leave it there? It really looks like something I want to take out and toss. Thanks!