Water Content
The water content of tube feedings varies with the caloric concentration. Generally, formulas that provide 1.0 cal/mL provide 850 mL of water per liter. The water content of high calorie formulas is lower at 690 to 720 mL/L. Adults generally need 30 to 40 mL/kg/day, so most patients who received EN need additional free water to meet fluid requirements. Free water is administered when water is used to flush the tube and as a bolus administration specifically for the purpose of meeting fluid requirements