Measuring 6 Liters Puzzle

The Puzzle:

Measuring 6 Liters
You are going to mix up some concrete, and in order to get it just right you need exactly 6 liters.

But you only have a 4-liter and a 9-liter bucket.

How can you do this?

(You have an unlimited supply of water from the hose)
Do you have the answer? Check against our solution!