Waterfall suggestion: 75 or 120 GPM? (video)

Thanks for that awesome analysis, very helpful. I really appreciate it.

You asked about the valve. I don't know what that valve is for -- possible that it was intended to drive the planned solar installation? Today is the first time I've touched that valve, so I don't know much about it. Can I maximize the flow rate on my waterfall by putting it to 10psi? Does maximizing the flow rate on the waterfall come with a higher energy cost? I notice the pump makes more noise when I turn the valve a certain way.
 
socrates said:
Can I maximize the flow rate on my waterfall by putting it to 10psi? Does maximizing the flow rate on the waterfall come with a higher energy cost? I notice the pump makes more noise when I turn the valve a certain way.
Yes and yes. It probably makes more noise at 10 PSI because the flow rate is higher. I bet the pump probably starts sucking air too.
 
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