et(min)* Water (A) Water (B) Water (C)         0 355,00 355,00 355,00 3 250,00 250,00 250,00 10 100,00 135,00 200,00 20 60,00 50,00 110,00 30 - 35,00 90,00 40 - - 75,00 50 - - - et(min)* = electrolysis time

Table 5: Total Hardness results for Water (A): tcG plus ammonium hydroxide; Water (B): tCG plus sodium hydroxide and Water (C): tCG plus lime.