Chem-Dry Tri-Cities

This review is for Chem Dry in the Tri-​Cities. There is only one, although the phone number may be different than this one listed.
Just the facts:
Their website says they use carbonated hot water extraction. In the details it says «This phenomenal carpet cleaning mixture lifts dirt to the surface where it is whisked away with the vortex power of the PowerHead, a high-​performance unit that applies the cleaning solution and then sucks away the dirt and water.»
They came to my house and here is what they did:
Vacuumed my carpet with an older, smelly Panasonic bagged vacuum.
Went in my bathroom and filled a tank with water from the tub faucet. I assume they added some cleaning solution.
Sprayed this by hand over the carpet in a light mist, carrying the tank.
Put a flat, round thick towel-​looking disk on an old, beat up looking machine and pushed it around the carpet. It did NOT suck or extract any fluids as there was no hose going out and no tank. It just rubbed the carpet with the round towel thing.
Then they left.
I had my doubts, but we left and came back 2 hours later and it smelled like… wet carpet. Not clean smelling. It was also sort of matted down in places, as they did not rake it up like most carpet cleaning places do. I called and said I did not think I got what was advertised. No extraction, no Powerhead as described. After a bit of disagreement, they said they would come back and redo it with the Powerhead.
Second time:
They sprayed the carpet with the hand held tank again but used a bit more fluid. I asked why they did not use the Powerhead to spray in the solution and they said it gets the carpet too wet so they never do that. So then they brought in the Powerhead machine. It was very old with paint chipping off and worn off. However it did suck the cleaning fluid out of the carpet while it rubbed with what they said was «metal brushes» (not sure this is good for carpet). Because it is large and round, they could not get near the edges of the carpet, so there was an inch or two of the perimeter that could not be cleaned. This time the carpet did smell better and looked cleaner and fluffier. Good enough for now, however, I am not using this service again. I get a much cleaner feel and smell from true hot water extraction, even if it does take longer to dry.
*note: I have my carpets cleaned every 6 months. We did not have any stains or visible dirt but we like to get any dust and dirt out anyway and enjoy the fresh clean feeling. We have used two other carpet cleaning places in the past and have never had any problems so we will be using those in the future.