Basically what the store was saying is to run it through the display tank and not the sump because you will cycled the display tank more often than if you do it in the sump. The sump water would end up being more UVed and the UVed exchange would only occur as often as the return pump cycles.
For a return pump, I have a Gen-X PCX40 in the basement and the max flow is 1190gph. I raise the water about 10 feet so I probably only get 800 gph.
Thoughts? I am leaning on running it in my sump (in the basement) as the QuietOne 1200 pump only does 290gph at 0' head and this is less than the 800 gph that the return pump does.
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