Can I filter ocean water with the Puritii water filter? Administrator August 17, 2017 18:55 The Puritii filter was specifically designed to filter fresh water, not salt water. Related articles Puritii Water Bottle & Filter Does the Puritii Water Filter change the pH of water? How long does the Puritii water filter last? How much water does each Puritii bottle hold with the filter in place? Are the Puritii water filters recyclable? Comments 0 comments Please sign in to leave a comment.