Colloidal Silver generator SB2 of BVT company with inbuild laser,automatic polarity switch,2 pure 9999 silver rods 3mm thick / 3inch long and inbuild stirrer, AC12 voltage/2amp.With this excellent colloidal silver generator it takes around 10 hours to create 1ltr. extreme high quality colloidal silver water 10 to 20ppm
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