I just finished up using a Goodway Ream-a-Matic tube cleaning machine for the first time and would like to share my thoughts. It is definetely better than our old way of doing it by hand.
We used this machine to clean two 30ton condenser cooling barrels. Tube size was 5/8". We used the Goodway Spin-Grit brushes.
Approximate cleaning time per barrel was 1 hour.
Head psi dropped from 250psi to 200psi and we had to adjust flow control valves to get head back up to 210psi that the chiller calls for.
This machine works great and is very easy to use. I really like the fact that water is injected through the cable and on to the brush while its feeding through the tubes. The forward/reverse foot switch is nice and the brush and cable assembly will feed itself in and out of the tubes. There is an adjustable positive stop on the cable that you can set to keep the brush from pushing all the way out of the other side of the barrel. The brush assembly we used cleaned very nicely. However I would like to add that we had no clogged tubes and only slight calcium build up in the tubes. The tube machine seems to be very well built and designed and comes in a nice roll around package. Power cord length is about 15' and comes with a built in GFCI.
This is an expensive unit for what it does. I actually borrowed it but cost is around $1500. The foot pedal only comes with a 10' long hose and if you are in tight quarters this is not enough. The cable used to feed the brush is very touchy. Make sure you don't have a bend radius of less than 3' because the cable will bind.
Overall if I did not have a source to loan me this unit I would buy one to clean 4 30 ton condenser barrels annually. I like it that much.