I always buy Tetra pumps but I've had a chance to try these and I'm impressed. It was quiet and functional. As with all pumps, noise will occur if any of the ports are left open. Once I connected hoses to both outlets, it was as quiet as my Tetra pumps. It's now set up to run two sponge filters and works well enough. Not sure if it can handle a 40 gallon setup, but it works great for my two 10 gallons. I didn't find anything to complain about. A good product.
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