The Hakko is a great high volume air pump. It is quite, runs relatively warm not hot, and is built like a tank. I strongly recommend this air pump to anyone with a larger aquarium or medium sized pond. The Hakko is for those who burn out two Walmart style, air pumps every year and are tired of the cheap junk. There are only two negatives that I can mention about this air pump. 1) It is not recommended for outdoor use and must be protected from water spray and rain. 2) Diaphragm air pumps can not tolerate back pressure. You will need to adjust your air valves so that all the produced air flow is balanced between the underwater air stones and the remainder released back into the atmosphere.
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