This work was conducted to obtain subjective responses to recycled water recovered from urine, laboratory data on the recovery procedures, and clinical data to indicate any pathophysiological effects. Four male human volunteers participated;an 8-week control period, during which a minimum of 1500 cc of distilled water was consumed each day, was followed by an 8-week experimental period, during which 1500 cc/day of distillate was to be consumed. A still of standard laboratory glassware was constructed to per¬mit recovery of large percentages of human urine. Chemical analyses indi¬cated that the distillate conformed to water standards established by the U.S. Public Health Service. The clinical examinations included cephalin-flocculation and thymol-turbidity tests, complete blood counts, and urin¬alyses. None of the subjects demonstrated psychologic or physiologic symptomatology;in addition, there were no significant physical findings, and the laboratory data were unremarkable. Slightly increased intake and urine output noted for the experimental period, in comparison with the con¬trol period, were probably due to variations in levels of activity, diet, and climatic conditions.
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