Solis INTENZA Water Filter Replacement CartridgeSolis INTENZA Water Filter Replacement Cartridge Keep your Solis Perfetta espresso machine in good working condition by replacing the INTENZA water filter approximately every two months (depending on the hardness of your water). Using a water filter will reduce the frequency with which you need to descale your machine and result in overall better tasting espresso. Its easy to replace as it fits directly into the water reservoir on any Solis Perfetta