I see a lot of people complaining about the weakness of their Aluball brew. I normally weigh out my prep, and normally use 15 grams per Aluball, and my grog is anything but weak. Recently I decided to try to make a stronger brew and packed it in the Aluball without weighing. It absolutely did not work. I got a weak looking, semi transparent brew, and when I opened up the Aluball, instead of it looking like soup, the inside of the pack was barely even wet. I then weighed out 15 grams, and all was very well.
The upshot is that the Aluball may not work if you pack the Kava in it too tightly. This happened for a second time just yesterday, but this time I know it was because I put too much Kava in the Aluball. Sometimes less is literally more.