Product review (1 stars): Horrible, a complete waste of time and money
Horrible, a complete waste of time and money.  As other have stated these granules do not work the same as the cartridges purchased pre-filled.  After running for several hours the granules clog up the cartridge screens, prompting an out of water shut down of the unit.  I followed the manual and removed a couple of tablespoons of the granules and the same thing happens after running the unit for several hours.  I did this multiple times on the same cartridge and it still occurs even though about a half of the original volume of granules have been removed.  I am really surprised that the manufacture did not do a recall of this item.  I guess it speaks to their integrity:  profit over doing what is right.  I hope they read this.