It came, very punctually from its EBay source. If you wish to know what it looks like running alone, check on Youtube.Many images available.\n \nIt had decent documentation for a Beta unit, but in my LFS I could find only a Chemi-Pure medium for de-nitration which turned into a coal-dust mess like London 1890. Luckily we tried it out in a bucket, first. So I have ordered pellets from Two Little Fishies that look more like the Youtube videos. When I have a picture of the unit running as in the video, in our own little tank, I will share it. So far I can say the thing DOES run quiet, is strong enough to fluidize media and small enough to fit in a largish raincoat pocket. What more could I ask for for .50? Of course is is not specifically a de-nitrator, but a reactor of one's choice, depending upon media.\n \nI will write again when the media arrives and share further. And I thank Northstar again for pointing me in the right direction. Splendid new toy!