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Loresco SWS® Earth Contact Backfill

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 Loresco SWS® Earth Contact Backfill manufactured in a highly controlled "hot" atmosphere

Loresco type SWS® is specially formulated for impressed current surface systems and is designed for use in impressed current surface systems. SWS® is also suitable for containerized anode systems and semi-deep impressed current systems. SWS® may be poured dry or through water or light mud.

Loresco type SWS® exhibits a hard, round shape and does not require tamping because of its ability to go full density with simple pouring. The bulk density of SWS® is 68 lbs. per cubic foot. The predominant particle sizing ranges from 1 mm to 5 mm with no particle larger than 12 mm.

The manufacture of SWS® is in a highly controlled "hot" atmosphere which produces a particle surface with wettable characteristics. This allows SWS® to be freely poured directly into water or light mud without sacrificing system integrity due to poorly compacted carbon. Set-up time is almost instantaneous.

Loresco SWS® is a product designed to be placed in the earth. According to EPA-approved leacherate tests, SWS® meets all purity requirements for materials utilized in underground burial.


Loresco type SWS® may be poured freely in dry applications. If SWS® is poured through water, the rate should not exceed one hundred pounds per minute. The rate of pouring should be decreased if the fluid is a light mud.

Horizontal Installation Procedure

  • Have a reasonably clean ditch (design usually calls for a ditch one foot wide)
  • Pour Loresco type SWS® in a continuous layer 6-inches deep (or as specified)
  • Place anodes on top of SWS®
  • Pour SWS® in a continuous layer until anodes are covered by a 6-inch backfill cover (or as specified)
  • Fill the remainder of the ditch as specified

Vertical Installation Procedure

  • Have a reasonably clean hole (depth depending on soil resistivity)
  • Place one foot of SWS® in bottom of hole
  • Lower and center anode in proper position
  • Pour SWS® over anode until design level is reached
  • Fill remainder of hole as design specifies


  • Bulk Density: 68 lbs. per cubic foot
  • Particle Sizing: 90% between 1 mm and 5 m


Loresco type SWS® is shipped in fifty (50) pound (22.7 kg) coated, woven polypropylene bags. SWS® may be stored outside for limited periods (not to exceed four hundred hours of sunlight). Pallets are available with fifty bags per pallet. Proven export packaging is also available.