content: The pump sounded like a good deal--SOUNDED is the word that needs to be taken into account here. I bought the pump for a reef aquarium. Before I installed the pump all I could here was the trickle of water from the other pumps. Turned this one on, and I thought I was in the middle of the freeway. LOUD!!! Other reviewers had said it was loud--I should have listened. I will be returning it this week. HyperFlow--It should be named HyperSound