How do you measure how much water a bath uses?

# Use a stopwatch and a large bucket that you know the volume of (5 gallons, 20 liters, whatever).

# Start running the water into the bucket at the same time as you start the stopwatch. You don't have to have the tap full on; any speed is fine; but don't adjust the tap/faucet till the bath is full and you turn it off. # Make a note of the time when the bucket is full.

# Pour the bucket into the bath. # Make a note of the time when the bath is full enough and you turn off the water. # So now you have the time it took to fill the bucket (say 45 seconds) and the time it took to fill the bath (say 6 minutes 30 seconds). And you know how much your bucket holds. # Divide the bath time (6'30") by the bucket time (45"). That's 390 secs divided by 45 secs = 8.66. That means it took 8.66 buckets to fill the bath. # Multiply your bucket volume by 8.66.

# So a 5 gallon bucket x 8.66 = 43.3 gallons. That's what your bath holds.

# Or a 20 liter bucket x 8.66 = 173.2 liters. That's what your bath holds.