there is the method but to understand it, or I'm not very good, or it is not far from the headache itself. I'm still come to the end, so it is possible ;-) on the cube after 15 days of use (about 1 hour per day on average), 3 pellets have a corner that slightly off ... I think it would be the same wherever you buy this product ... but at least I got the price, packaging, speed and no shipping costs guaranteed by amazon, so this product in my mailbox 3 days after ordering, before Christmas, without having to take my car, searching the shelves, debate in the crowd and queue at the cash ... Thank you amazon.
