Here the men have loaded the mix and are cleaning the hopper, and adding more epwater until the mix is just how they want it.  Another advantage of the mixer is that the sand, water, and cement don’t necessarily have to be in the same location. 

Here the men have loaded the mix and are cleaning the hopper, and adding more epwater until the mix is just how they want it.  Another advantage of the mixer is that the sand, water, and cement don’t necessarily have to be in the same location.  (Javier Figueroa)