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I do something similar, I keep my fermentor in a big rubbermaid bucket filled with cold water. If I need to make it even colder I drop in water bottles that are filled with ice, as they melt, I swap them out for others and put them back in the freezer. I don't have temp controlled fermentation (yet) and this method seems to help keep the ferm temp somewhat ...

While sugar solution is thicker than water, it's only by 4-10% for a typical brew, so I doubt that is your problem. It's more likely a partial blockage or a connection that is letting in air. One other thing that can cause a reduced flow - it's important to get all air out of the tubes that run from the kettle into the pump. I have the pump placed below ...