Northern Filter Sand

Northern Filter Media, Inc. is the leading US manufacturer of filter sand for the potable water, wastewater and pool industries since 1914.

NOT ALL FILTER SANDS ARE CREATED EQUAL!
All of Northern’s Filter Sand has been formed from a natural glacial deposit formed millions of years ago along the Mississippi River Valley. Northern Filter Sand resource is comprised of over 500 acres of sand and gravel to a depth of 110 feet. Once dredged, all of our filter sand is processed through our state of the art hydraulic classification plant for cleaning (triple washed) and pre-sizing. Then it is dried and sized to your specifications by sending it over a series of vibrating screens with effective sizes and uniformity coefficients guaranteed.
High quality filter sand requires the proper angularity, hardness, spherecity and size. Northern’s Filter Sand meets or exceeds all of these requirements which increases the holding capacity of the media. It also improves efficiency by reducing retention time and head pressure loss with greater flow rates. Ongoing quality control testing starting with the production process through to shipment ensures our media meets your specifications for uniformity coefficient and effective size.

Advantages

• Northern Filter Sand is graded specifically for water filtration plants

• Filter Sand can be used in municipal, industrial or residential applications

• The angular shape of the uncrushed filter sand promotes good flow and even distribution

Physical Characteristics

• Color: light tan

• Bulk Density: 100 lbs./cu. ft.

• Specific Gravity: 2.65+

• Effective Size: .25 – 2.5 mm

• Uniformity Coefficienty: 1.3 – 1.7

• Hardness: 7.0 (Mohs scale)

Operational Specifications

• Bed depth: 12 - 36 in.

• Freeboard: 40% of bed depth (min.)

• Service flow rate: 2 – 5 gpm/sq. ft.

• Backwash flow rate: 15 - 20 gpm/sq. ft.

• Backwash expansion rate: 35% of bed depth