Elimination of waste product from a normal person requires a minimal amount of urine of

For excretion of solutes (waste products) from kidney:- Normal (at a concentration of 290 mOsm/L) → 1 litre of urine per day is required. When there is maximum concentration (1400 mOsm/L) → Only 500 ml of urine per day is required. When there is maximum dilution (30-50 mOsm/L) → 23.3 L of urine is required.