1. n. [Drilling Fluids]
Water that does not contain divalent cations, such as Ca+2, Mg+2 or Fe+2 and is therefore suitable for prehydrating bentonite or polymers.
Synonyms: bicarb
Antonyms: hard water
See: acrylate polymer, EDTA, guar gum, hardness ion, hydration, prehydration, starch
