The way, I look at Marks question, is that he knows that besides the Mercalli filter, there also is the Shaker. That comes in the same package. Is a kind of free.
It seems to be impossible for him to test this in a demo-version (then there is no shaker?), before buying?
I can't recall, because I have bought the Mercalli filter (and Shaker), so I don't know anymore what was in the demo.
I think he wants to know if somebody has already used the shaker and what the result is.
If the result s good, he will buy Mercalli. If not?