In the past, the manufacturer has always advised against filling anything into the tanks except water, because this could damage the electronic pumps in the devices. So now even something from Omo works? That's interesting. It would certainly be something, but only if it were interesting in terms of price. 16 dollars for 450 ml doesn't sound cheap either. I think something like that would easily cost twice as much in our country. What is certainly recommendable is to use filtered water and not just tap water, because that contains quite a lot of lime, depending on the region.