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Yardney MM-1860-3AS Multimedia Water Filtration system with 18in wide tanks that are 60in tall x3. AS means automatic special. The special being that there is a master valve assembly on this system. When the system goes into a backwash, the effluent (product line) closes off via a butterfly valve and all water/pressure is used to get that backwash going. (Media: Anthracite, Fine Garnet, Course Garnet, Gravel).Additional Prep Fees May Apply