Just thought i would share my experience with this. Decided to use this one as i couldn't be bothered dissolving the granule one.
Borrowed dads old "quoting" vehicle that he obviously never looks after. The water in the radiator litterally looked like the muddy water you would see in the Pig Pen at Cruiser Park
I had to flush with fresh water 5 times just to get it to stay clear.
Looking through the radiator cap hole, the top tank was covered in rust that did not just wipe off with your finger.
Used the HD2 and ran it for 30 minutes.
Flushed it another 3 times to make sure that was all out.
Top tank was all shiny again looking like new
Refilled with some good coolant and it now runs at about the quarter mark on the gauge, whereas before it was at about half way
Highly recommend this product
