Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Junk total junk

After soaking the 3" stone for about 40 minutes instead of the 15 (because I forgot about it for a few minutes), I hooked it up only to be disappointed with it's bubble output. There are only a few bubbles that come out on the sides and not from the entire top or even a quarter of it. My 1 inch stone produces a hell of a lot more bubbling that this entire piece of floating junk.