W.M.T.’s deep-bed sand filter is downward flowing fluids type and can operate with a feed pressure of 2 to 5 bar (28 to 70 psi).
The loss of pressure across a clean sand bed is very low.
The particulate solids are mainly captured on the bed surface.
The grains used are subdivided with different granulometry in three or four stratum.
The grain range goes from 0.6 to 14 mm for specialist applications other sizes may be specified.
Normally siliceous sand from the following characteristics is employed:
- Acid solubility: less 1%.
- Specific gravity: 2,67 t/m3.
- Hardness: from 6 to 8 on scale MOH.
- Approval ANSI/NSF 61.
- Standard to WWA B100-01.