Marineland Emperor 400 power filter for everyday use or FOR PARTS, complete with all cartridges. I have three (3) of these in this auction, all were working when unplugged years ago, so if they still work, it's your lucky day! Otherwise they are being sold FOR PARTS. The majority of the mineral deposits on the filter should be able to removed fairly easily since this filter was in Mississippi River water, not HARD well water. 2 of 3