... Potential Ceramic Ball 1.sizes: 2~3,4~5,6~8mm or etc 2.used for reducing ... value Negative Potential Ceramic Ball Specifications:3mm, 5mm Main Ingredients: Tourmaline Ceramic Ball, Negative Ion Powder, Germanium Powder, ... 0 mv ~-500mv, PH value to about 7.5, and many air bubbles produced oxygen-rich water. ... ~ - 500mv, adjusted PH value to about 7.5, and many air bubbles produced oxygen-rich water when ...