Interwater Interwater Europe is a private company based in Thessaloniki, Greece which specializes in developing manufacturing and marketing water filters and drinking water treatment systems around the globe. Interwater Europe manufactures and develops OEM/ODM products in Europe and Asia since 2004. Interwater is constantly expanding its range of products with the main axis of clean drinking water, having from small to large filters, water purification systems for private and professional, giving a final solution to any water problem you face. Our primary concern is our customers full satisfaction.