In a word, very useful. There's diamonds in dem dar hills! I used to make a big batch of kava on Sunday morning and then do a second wash which I downed with my coffee. Big mistake! I was looking for the couch by 10am. Moral of the story, the second wash can be very potent. Just squeeze the living holy si_ _ out of it. Perhaps you could bottle it for a quick pick me up when a full dose is not necessary. One more thing, I used to squeeze enough kava for (2) 16oz bottles so I had quite a bit of root left over for my second wash.