Originally Posted by
Waterlogged
OK, so with 1 of those previously mentioned posts out of the way, I pushed this up and have something to report.
Yes, it will flow back through the pump into the res but, I think it can be limited as to how much with the right fittings. I was using a DD "T" for the junction where the pumps went serial and that gives the flow a straight path to the other pump should it fail. If a Y is used instead, the flow will be less inclined to make the U turn needed to take that path. It'll still probably happen, but to a much lesser degree. Even with the setup I had (similar to the diagram I made), short of fully closing the valve on my testing res, water was still coming out the proper fitting. Personally, if I were you, I'd give it a try but, that's because I love to tinker too much. :rofl::shakes:
As for the flow meter, are you 100% positive that it is calibrated properly (actually pumping 200L/H)?