Seychelle 28 oz Flip Top Water Filter Purification Bottle with Standard and Advanced Filters This bottle and second filter will produce up to 200 gallons of great tasting water! filter is ideal for any in or out-door use; like traveling, hiking, biking, camping, fishing or for emergency purposes. It can be used with any type of water source; tap or rainwater, rivers, streams or even lakes It can be used with any type of water source; tap or rainwater, rivers, streams or even lakes (Excluding salt water). It works by a combination of sucking the water out of the top and squeezing the bottle at the same time. This Comes with a Standard Filter and an Advanced Filter!