Self-cleaning type filters brought to you by Grotto Filters are suitable for filtering a wide variety of fluids to remove dirt, undissolved lumps, rust particles & other undesired material. This metal filter cartridge is an assembled unit comprised of wheel shaped filter discs & spacers stacked on a rotable shaft. The cleaning blades are mounted on a stationary rod adjacent to the cartridge stack and project into the spacing between the filter discs, thus when the cartridge is rotated the cleaning blades comb out filter slots to their full depth - mechanically & positively. The implementation of this product in your applications makes your work done efficiently and effectively.