FIRST CONCORD-ELEKTROHYD PUMP MIXER  READY TO DELIVERY 

That's crazy. Never seen one in person. 

6 yards down, got 244 to go! Now what?... I have never seen the point of these, they're cool but practical? Also have never personal seen one so I can't say too much

It would be great for having your grout for a big system pour. It never fails that the grout shows up way before the first load of concrete and everybody is freaking out wondering why you arent pumping.

Haha true, they'll show up with a yard of grout and I always have the driver add 50 gallons fill up my hopper and leave

Where do you washout when your done? lol Very nice looking unit

I never put the grout in the hopper until my first truck of mud is there to follow directly behind it. A little lead water ahead of the grout just to be safe.  The vibration of the truck could cause the materials to settle while waiting on the mud and you could end up with a nasty plug. Not saying you're wrong, do whatever works best for you.

In our town about 60% of all pumps are combi pumps. They make loads of money. Stupid???

This kind of machines , save money and time.  Its good machine for small job side . 

In European market its all concrete pumping companys use them.