I just bought a similar cheap pump for the same purpose (I wish I'd bought that same one you did). I was going to take it for a test drive today but the forecast is thunderstorms. I'm wondering how it does with pellet hop gunk.
Why is it the food grade pump on amazon is $30 but a pump for brewing cost over $100. https://www.amazon.com/temperature-108GPH-DC12V-Water-grade/dp/B007XZAJ3I