An ORS packet is dissolved in 1 L of water to produce a solution containing the following (in mmol / L): Standard WHO ORS: Sodium 90, potassium 20, chloride 80, citrate 10, and glucose 111 WHO reduced-osmolarity ORS: Sodium 75, potassium 20, chloride 65, citrate 10, and glucose 75 ORS is effective in patients with dehydration regardless of age, cause, or type of electrolyte imbalance (hyponatremia, hypernatremia, or isonatremia) as long as their kidneys are functioning adequately.