Well, unfortunately, far too expensive

The filters are good and practical because the water is not an extra filter must, unfortunately, the filters are very expensive if you compare the times with a conventional filter BWT, there holds a cartridge about 1-2 months as well as here, only with BWT gets one 4 + 1 cartridge for 15 and not 1 for 10 ... so it's cheaper again itself to filter and save your money for the filter.

Ebay is also refillable filter, but in this case do not know what you purely pours into the stomach ....