Great Lakes Filters We are one of the pioneer companies who deal exclusively in filters, filter fabrics, and filtration solutions for industry. It has always been our policy to select and recommend "Filter Media" on the basis of performance, service and economy. Because of our position as a leader in this industry, manufacturers bring their new products to us for evaluation. Thus our customers are kept apprised of new developments in the field of filtration. We are application driven in our recommendations to you.