When I first tried Pyrocat, I ordered the 50L size from the formulary. Once I tried it and liked it, I ordered the bulk chemicals to mix my own. This was so I could mix it in Glycol. Now that the Formulary sells it premixed in Glycol, I'll have to rethink mixing my own once the dry chemicals run out.
While this stuff is great to use, some of the chemicals can be really nasty if not properly handled. Just my 2 Cents.