I've only used it a handful of times so far, but I've used it to mix my own KCl pH storage solution, make nutrient teas, and last time I added vermicompost and other stuff too to make a EWC and guano tea.
It is harder for the magnet to spin the solution if you put too much compost in it though. Last time I put a little too much in so I had to get it started spinning manually with a stick to help it, but then it was fine the rest of the way.
I should also mention this is just a quart jar in the pic. The 1/2 gal fits perfect on it, but they were out of them last time I looked, and I've just been having fun with it. I did mix the KCl in my last new clean 1/2 gal jar though. 1/2 gal really is the perfect size if you ask me.
