skip to 7:30.
What is interesting is that the k1 media has such a tiny surface area. It is totally useless for most tanks considering the amount needed is so much huger than people typically have available. If you have 1 liter is only enough to process waste from approximately 3 grams of food. On top of that the pricing has shot through the roof, so even if you are willing to make a big sump then it has gone from a way to cheaply and easily filter a tank to something prohibitively expensive. Really it works best for a big pond or waste facility where size is not an issue but even maintenance once a year can be an issue.
So if you are thinking about getting some k1 media for your canister filter, you should probably forget it.