2 x 1 liter Refill (2x700g = 1.400g net weight) - water filter (in-Ta-Fil, Claris, Aqua Prima, Intenza, Laurastar) / humidifier (eg Solis) / ultrasonic
Works very well, doing what it should, namely filters the lime out. I use it for my filter jug of Tupperware and get so much cheaper than the refill bags.