04-10-2012, 01:43 AM
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Well, from my understanding it doesn't reduce he flow at all. I was looking into buying Eheim ETH for reef tank but I didnt want to many cuts/connections that could lead to potential leaks.
According to websites like marinedepot and fosterandsmith, there in no minimum or recommend flow rate. I think the water flows relatively straight through without compression. However, the slower the rate, the more contact it will have with he heating element warming your water faster (logically speaking)