Cartridge Filters are developed to replace existing Large Volume Filters. Sintered powdered metal, wedge-wire, string wound and other type of cartridges are use to replace existing large volume Filter Bag & Filter elements. In many instances flow rates may be dramatically improved without compromising filtration efficiency in other instances, frequency of down time for element cleaning and replacement may be sharply reduced resulting in savings which can far out weight initial retrofit costs. Element are fully cleanable and reusable, eliminating repeated cartridge replacement and, waste cartridge disposal.