Actually the directions are 1 ounce by weight, not 1 fluid ounce.
I found this e-mail response from Five Star on another forum.
"You are correct! All our powders have recommendations by weight, whereas our liquids are by volume. We find that one gently rounded teaspoon of PBW is about 1 oz...
I just made a couple calls looking to get my 5# tank filled in the Madison area so I thought I would update prices on here.
Jefferson Fire:
5# = $13.90
Madison Recharging:
5# = $10
I didn't call Badger Welding as I have a brand new tank and didn't want it swapped. Both Jefferson Fire...