That pump will be about similar to a faucet, 300gph is 5 gallons per minute. Should be sufficient. But you still could do the shower arm thing too, if you didn't want to buy a pump. Also you could use the bathtub for the water container for the pump. The shower arm thing would probably be the cheapest, but I've heard the ice bath/pump saves water and cools faster. I don't know from experience, I personally use a plate chiller, but I've read/talked with people who've done the pump thing. Let us know what you decide and how it goes.
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