Just did some tests
Here are my numbers
Straight pump:
Rio 180 took 40seconds to fill 1 gallon of water
Aqua Via 1300 took 22seconds to fill 1 gallon of water
Rio 180 Pushing water through the Via Aqua w/ Via Aqua off:
Rio 180 took 45s to fill 1 gallon of water
Via Aqua sucking water through Rio 180 w/ Rio 180 off:
Via Aqua took 28s to fill 1 gallon of water
Pumps in Tandem:
Rio 180 pushing water into the inlet of the aqua via both pumps on..
Took 22seconds to fill 1 gallon of water.
There is no advantage in GPH with both pumps together.. The only advantage I have seen is with head pressure and of course redundancy. I don't hear the ticking from the rio 180 anymore now that I put more water in the tank.. so who knows.
Both pumps combined head pressure would be 8ft to 9ft.
It seems that both of the pumps working together doubles that.. I am going to get a straight piece of 1/2" 20ft vinyl tubing and test it out.. from a bedroom window.
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