The CamelBak Fresh Reservoir Filter clicks on to your Antidote reservoirAAAor any other one outfitted with the CamelBak Quick Link adapterAAAto filter out bad tastes and odors. The Fresh filter works on the fly, without impacting water flow rate, so you get clean-tasting water immediately. This convenient component filters up to 120 liters before requiring a new set of carbon filters (sold separately).