Instruct: Classify Amazon reviews into positive or negative sentiment
Query: disappointing

well, I must have gotten a defective one. I placed it in our pond which has full direct hot sun and it made lots of noise but didn't pump at all. I tried putting it in just a big barrel full of water to see if it would pump in that, and nothing. I returned it for a refund and won't try again, too disappointing. I have other solar products doing just fine in the blistering sun here.