OK, this, to me, says it all. Penac, or their distributors, have basically taken something which is beneficial when used as intended, and put a marketing spin on it, to appeal to those who will be appealed by it. Is clay beneficial in the substrate as an additive? Of course!...Similarly, Penac products (German engineered, btw) are tagged with a lot of mysticism that we are not accustomed to. However, most of the products do have some tangible benefits we can measure and appreciate. For example, Penac W is essentially a type of bentonite clay that, when added to your substrate, will increase it's CEC and add needed micro nutrients/minerals. Penac K adds minerals plus organics.
In my opinion, what Penac has done is taken items that are very beneficial and sprinkled some marketing pixie dust on them in order to sell more of them in certain parts of the world. That doesn't work here.
If we had the marketing skills, knowledge, and financial wherewithal to do it, we could all do similar things with ridiculous claims, and someone would find them irresistable. Let's see, I'll get some kitty litter, soak it in some of my healthy tank water, then market it. It could be 'power clay with aquatically aligned water molecules from a healthy tank to remind the water of the new tank how to be healthy'.