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Specific Gravity 2.50
Bulk Density
 80 to 85 lbs/cu. ft.
Effective Size From 0.30 to 1.80 mm
Coefficient of Uniformity Ranges from 1.45 to 1.60
Estimated Sphericity 0.30 to 0.50
Porosity Typically 48%
Shape Angular to sub-angular
Permeability VF25 typically 4.0 x 10-1 cm/sec
Physical Composition Amorphous soda-lime glass

Typical VitroClean® Filtration Product Specifications (VF-N)
Product # Number
U.S. Mesh Size
Effective
Size mm
Approx. Size
Range mm
VF#5
1/4" x 1/8"
NA
7.1 x 3.4 mm
VF#25
16 x 35 mesh
0.45
1.1 x 0.4 mm
VF#35
25 x 50 mesh
0.30
0.7 x 0.3 mm

Functions

Product #
Functions
VF#5
Used to cover base and laterals as a direct replacement for pea-sized gravel
VF#25
Main filtration media for all types of applications; direct replacement for #20 silica sand
VF#35
Filtration media for systems requiring finer particle removal and as a top layer of stratified filtration systems


VF#5 is used in pressure filters as the base to support VF#25 and enough should be added to cover the laterals plus some. This will protect the laterals, minimize discharge of fine filter media, and improve permeability and filtration. The bulk of a pressure filter should be made up with VF#25, which is essentially equivalent to #20 quartz filtration sand. If better filtration is required VF#35 may be put on the top of the VF#25, but there will be an increase in the pressure drop across the filter bed. Where better filtration is required and a lower flow rate can be accepted VF#35 may be used to make up the main filter bed.

Flow Rates

  • Recommended maximum flow rate for basic clean water filtration is 12 to 15 gpm/ft2 of filter bed. This rate would be satisfactory for swimming pools, spas and other low particulate loadings. Lower flow rates such as 4 to 6 gpm/ft2 result in more particle removal, but it may not be practical or necessary.
  • For storm water runoffs, waste water treatment systems with heavy loadings much lower flow rates are required and back washing will have to be more frequent. A coagulant such must be used to prepare the influent for filtration if low ntu readings are required on the effluent.
  • Back washing should be at a minimum of 15 gpm/ft2 where NSF standards apply, but should not be in any case less than 10 gpm/ft2.
  • The frequency of back washing is dependent on the loading of the influent and the results desired.


Typical
Chemical
Composition:
SiO2—73%
Na2O—14%
CaO—10%
MgO— <1%
Al2O3— <1%
SO3— <1%














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