A mixture of coke-like granular carbon and iron filings was used for the electrode material and a mixture of kaolin clay and iron filing was used for the treatment zone material.
(A mixture of coke-like granular carbon and iron filings; was used; for the electrode material and a mixture of kaolin clay) (iron filing; was used; for the treatment zone material)
A mixture of coke-like granular carbon and iron filings iron filing
was used was used
for the electrode material and a mixture of kaolin clay
for the treatment zone material