Yeah it’s becoming pretty ridiculous priced
I collected a bunch of the 1 gallon jugs slowly at about $16-17 price and that’s how I was able to do a coolant flush and I was expecting the liquid to be still partially usable after
It took about 5 jugs because no heater core
And when I drained it into a bucket to save I saw it was completely used and black so there is was more to dissolve in my water jacket.
I did a second round but it’s getting pricey and I’ll think long and hard before I do it again

But the results were great!
-s