Actually, we were very pleased with the granules. The taste of the water is good and in the granulate consumption is also very economical, compared to the original Refill of Tupper we could save a lot - at least at first glance. Unfortunately, moisture formed in the original container of the granules. As this can form bacteria, we have disposed of it and again bought us all new. Consumes we had maybe about a quarter until then. First we Dachen, we had the granules stored incorrectly, that it was perhaps too cold in our pantry. But even at the second attempt rapidly formed this time moisture - after the second filling our Tupper-water filter, so after about 4-6 weeks. And this time we had stored the container warmer, because it can no longer really have lain. And counted on only 2 fillings the granules are then again much more expensive than the original packs. We moved again ...