Although these brines have the great advantage of low cost, they have the disadvantage of being extremely corrosive, and the calcium brines have the disadvantage of throwing down insoluble precipitates with untreated waters. Corrosion in closed systems can be largely overcome by the addition of sodium dichromate, Na2Cr2072H2O, 100 lb and 200 lb being required per 1000 cu.ft. of calcium and sodium brines, respectively. Enough caustic is added to make the brines slightly alkaline. Open calcium brine systems may be protected by additing zinc dust at the rate of 60 lb1000 cu.ft. a little at a time.

Although these brines have the great advantage of low cost, they have the disadvantage of being extremely corrosive, and the calcium brines have the disadvantage of throwing down insoluble precipitates with untreated waters. Corrosion in closed systems can be largely overcome by the addition of sodium dichromate, Na2Cr2072H2O, 100 lb and 200 lb being required per 1000 cu.ft. of calcium and sodium brines, respectively. Enough caustic is added to make the brines slightly alkaline. Open calcium brine systems may be protected by additing zinc dust at the rate of 60 lb1000 cu.ft. a little at a time.