Missouri Filter Chemical/Filter Feeders  Neptune Filter Feeder Model FTF-5DF Neptune's FIRST Filter Feeder with Full Botton Drain and Anchor Bolt Holes The Neptune Filter Feeder combines chemical addition and high capacity filtering in one piece of equipment.  It is a convenient way to introduce solid or liquid chemicals into hot or cold water closed circulating systems. Eliminates need for separate By-Pass Feeder and filter. Filtration can be achieved at the same time as chemical addition. Extended neck with top inlet allows simple installation of filter bag and basket. Filter bags are available in 50, 20, 5 and 1 micron ratings (sold separately). Filter bags are quickly and easily replace.