Here's what other sites are saying:
If your Katadyn Vario Water Filter has been on more than a few multi-day trips with you, it may be time to replace its carbon with the Katadyn Vario Carbon Replacement. The Vario's carbon core's carbon has an extremely important job in your water filter--it reduces chemicals, pesticides, and keeps your water tasting fresh. Best to replace the carbon when your water starts to taste a bit funky. *Vario carbon core not included, just carbon.
Description of Katadyn Vario Carbon Refill - 2 PackKeep you Vario filter working up to standards by replacing the carbon every 200 liters.
- US Outdoor Store
On Sale. Katadyn Vario Replacement Carbon Filter Vario Replacement Carbon Filter by Katadyn for eliminating odors.
Replacement cartridge for the Katadyn Vario Microfilter.. . . Replaceable filter element can last up to 500 gallons (depending on water conditions) before needing replacement. 0.3 micron high surface area; pleated glassfiber microfilter removes waterborne bacteria and cysts. Carbon core in replacement filter keeps water tasting fresh, and reduces chemicals, odors, and toxins through life of cartridge
Katadyn Vario Replacement Cartridge
$15 - $44
Katadyn Ceradyn Filter Element
Katadyn Exstream Cyst Filter
$17 - $19
Katadyn Gravidyn Filter Element
Katadyn Drip TRK Filter Small Parts Kit
Katadyn Expedition KFT Filter Small Parts Kit
Katadyn Vario Ceramic Disc
MSR Guardian Purifier Hose Kit