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Sawyer recommends backwashing your filter after each filtered bucket, or at least 1 time per day. Backwash after prolonged storage, when you are ready to start using your filter again.

The frequency of cleaning depends on how dirty the water is. With relatively clear water, backwashing may only be necessary every 1,000 gallons whereas with extremely turbid or muddy water, backwashing may be required every 10 gallons. Nevertheless, backwashing is an extremely simple process and takes only a minute.

We recommend backwashing your filter when you flow rate begins to diminish, before prolonged storage, and when you are ready to start using your filter again. Backwashing your filter after storage is a great way to re-wet the filters and restore the flow rate before use.

The Sawyer filter does remove taste that comes from bacteria, dirt, and green matter. However, the filter does NOT remove iron, sulfur, other chemicals, or simple compounds. Taste can be masked by using flavor additives like Gatorade or crystal light (filter needs to be cleaned immediately after using them). Standard Sawyer filters are not made with charcoal. While other portable filters have charcoal, they lack in amount of media and adequate dwell time. Therefore, they only remove small amounts of heavy metals, pesticides, etc.

No, the filters do not remove metals, chemicals, pesticides, VOCs, hydrocarbons, or salt.

Your filter is safe from freezing temperatures if it has never been wetted. While there is no definitive way to tell if a filter has been damaged due to freezing after initial wetting, Sawyer recommends replacing your filter if you suspect that it has been frozen. If you are in freezing temperatures, we recommend that you store your filter in your pocket or close to your person so that your body heat can prevent freezing.