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2003 - 2005
All rights reserved.

Royall Pump
& Well Company
Robert W. Royall, Owner

2958 Anderson Highway
Powhatan, VA  23139


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Automatic Backwashing Filters - Whole House Filter
A backwashing filter is a water filter that cleans itself periodically by rinsing away impurities it has filtered from water.

Although a backwashing filter may look like a water softener and be the same size, it's a different animal. Softeners are "ion exchangers," not filters.

A backwashing filter is a simple device that consists of a large tank called a "mineral tank" that is filled with a a filtering substance called a filter medium. (The plural is media.) Water enters the top of the tank through a special control valve and passes downward through the medium, which removes impurities and holds them. Some media do not hold impurities, but cause a change to occur. Calcite, for example, increases the pH of acidic water. The filtered water then enters a tube at the bottom of the mineral tank, passes upward through the tube (called a riser), and exits the filter via the control valve.


  • Fleck 2510 control valve
  • Adjustable cycle times
  • High backwash flow capability
  • Poly wound mineral tank


When the filter medium is saturated with contaminants, the control valve initiates a backwash. The backwash is an operation in which water passes backward through the filter at a rapid rate. It enters the tank at the bottom via the riser tube, then passes upward through the filter medium, exiting at the top, via the control valve. The rapid upward flow, in addition to washing away stored impurities, fluffs and resettles the medium bed, preparing it for another filtering cycle.

Backwashing filters can be filled with several types of medias to handle different impurities that may be found in your water supply.

Click here for Media Selection Guide ...

General Specifications

(see "Filter Media" section for applications)

Less Filter Media

Filter Media Capacity (cu ft) 1.00 1.50 2.50 3.00
Underbed "D" Gravel Required (pounds) 20 20 50 50
Mineral Tank (polyglass) 9x48 10x54 13x54 14x65
Service Flow Rate - Continuous2 (gpm) 4 5 8 9
Service Flow Rate - Intermittent2 (gpm) 6 7 10 11
Backwash Flow Rate3 (gpm) "WF" units only 5.0 5.0 7.0 10.0
Gallons Used/Backwash "WF" units only 100 100 140 200

Space Required (DxWxH inches)                         WF

9x11x56 10x12x62 13x13x62 14x14x74

9x11x52 10x12x58 13x13x58 N/A

Approximate Shipping Weight (pounds)           WF

27 32 40 49


20 25 33 42
Note 1: See "Filter Media" section for selection of proper media for your filtration application.  Note 2: Use of a flow control in the Service Line is highly recommended.  Note 3: Caution should always be used in sizing filters! Always choose a unit by first satisfying the Backwash requirement.  Consult the factory or your field sales person with questions.

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