If no further water reabsorption happened beyond the distal tubule, roughly how much urine would be produced daily?

1. At the transition from the distal tubule to the collecting duct, about 20 percent of the original water is still present. 2. About 10 percent of the filtered sodium is still there too. 3. Filtered volume is around 180 litres a day, so that remainder is a very large quantity of fluid. 4. Left unrecovered, it would leave the body as roughly 20 to 25 litres of urine a day. 5. Actual output is one to two litres, so the collecting ducts and the vasa recta must recover almost all of that remainder. 6. The 180 litre figure is the whole filtered volume, before any reabsorption at all. 7. Two to three litres is close to normal output and would imply no further recovery was needed. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 25 "The Urinary System", section 25.6 Tubular Reabsorption_