The investment in the brand cartridges worth it. We have very hard water and have to rely on filters. I had times "noname" filter bought, I would not recommend. The cheap filters are fit often not optimal, the water runs partly just to the filter elements passing in the decanter. That is then not particularly useful. So, in the "bite the bullet" and buy the brand-name cartridges. I did some research, compare various providers worth it!
