Slag contains significant (sometime tens of) percent pure, reduced, but the raw, not obttained, unutizable metal (in past times, deficiencies of contemporary processes), which reduce their resistance even more than 6 orders of magnitude, thus helping very steep conduction of the discharge current into deep underground.
Slag ina Muhimu (wakati mwingine makumi ya) asilimia safi, kupunguzwa, lakini mbichi, si obttained, unutizable chuma (katika nyakati za zamani, upungufu wa Michakato ya kisasa), ambayo kupunguza upinzani yao hata Zaidi ya sita amri ya ukubwa, HIVI kusaidia sana mwinuko conduction ya kutokwa sasa ndani ya chini ya ardhi kirefu.