A Nature's Way product. Complete with all attachments, and operating instructions. Tubing in very good condition. It was purchased in 1990 for $379.00. According to the booklet:- It improves the pH of the water. It adds to the water's oxygen balance. It does leave in trace minerals. It significantly reduces unpleasant odours, nitrates, Sodium, Heavy metals, Flouride, Chlorine, Asbestos, Pesticides, THM's & Fertilizers.