Product Catalog

Loresco SWK® Earth Contact Backfill

View PDF  |  Add to Cart

Loresco SWK® Earth Contact Backfill for impressed current surfaces

Loresco type SWK® is designed specifically for impressed current surface, containerized anodes and for use around anodes in the earth.

Loresco type SWK® has particle sizes ranging from 0.1 mm to 12mm. SWK® is heavy and sinks readily in water or light mud. It can be installed by pouring around the anodes and tamping is not necessary.

The particles of SWK® exhibit a hard, round shape and are composed of almost solid carbon. The bulk density of SWK® is seventy pounds per cubic foot and the porosity is forty-four percent. 

Its low resistivity enables intimate anode contact and assures that most electrolytic discharge will occur at the backfill periphery. According to EPA-approved leacherate tests, SWK® meets all purity requirements for materials utilized in burial.


Loresco type SWK® may be poured freely in dry applications. Tamping is not required. If SWK® is poured through water or light mud, the rate of pouring should not exceed the rate of wetting and sinking SWK®. The rate of pouring through water will be approximately one hundred pounds per two minutes.

Horizontal Installation Procedure

  • Have a reasonably clean ditch (design usually calls for a ditch one foot wide)
  • Pour Loresco type SWK® in a continuous layer 6-inches deep (or as specified)
  • Place anodes on top of SWK®
  • Pour SWK® 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 SWK® in bottom of hole
  • Lower and center anode in proper position
  • Pour SWK® over anode until design level is reached
  • Fill remainder of hole as design specifies


  • Bulk density: 70 lbs. per cubic foot.
  • Particle sizing: ranging from 0.1 mm to 12 mm

Shipping Data

Loresco type SWK® is shipped in fifty (50) pound (22.7 kg) coated, woven polypropylene bags. SWK® 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.