You know, I was only joking... that fan won't be very powerfull at all, to move water, I'm sure it wasn't meant to be used that way, rather it was probably meant to be used in a very humid application, like sucking air up a bong. The waterproof thing is just a demo.
You'd be better off with a belt driven paddle wheel. BTW, you'd still need a pump for that second loop.
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