As a long time Hydor Power Head user and with no complaints I figured for the money and a gph 1600 rating I'd give it a try. When it arrived I was shocked, compared to the Hydror it was a lot smaller so after giving it a try I filled the kitchen sink and gave it a try. Of course the output flow wasn't what I compared to my smaller hydror which is rated at 1100 GPH. I was able to sell the head to a guy down the street who had an FW tank and get the money back for what I know a Hydor Korillia is. I strongly believe these heads are for FW tanks and do not have the flow required for seawater tanks.
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