Katadyn Vario Replacement Element should be replaced after 2,000 liters or when the flow becomes too slow.
For maximum pleated cartridge life, use the Katadyn Vario Microfilter in "longer life" mode, which produces one quart per minute.
The Katadyn Vario water filter is effective against bacteria, protozoa, chemicals and toxins, and particulates! Add some purification tablets (sold separately) and kill viruses too.
Filter is ultra compact and weighs less than a pound and with its dual pumping system it is fast!