Profile: ErtelAlsop supplies liquid depth filtration products like laboratory filters, plate & frame filter presses, filter pads/sheets, filter paper, Pak® lenticular filter cartridges and housings. Our sealed disc filter is an enclosed horizontal plate filter. We offer accordion shaped filter cartridge, which provides an enclosed filtration environment and much shorter changeover cycles than plate and frame filter presses. We provide a wide variety of laboratory filtration equipment for bench or pilot scale applications.