Jebao DC 12000 not performing as advertised.?? Math problem?

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I'm running a DCT15000, it is a 1.5" NPT, thus I used a 2" PVC female adaptor. I reduced this to 1.5" PVC to return to my 170G. At 2/10 flow rate selected, and a 4.5' head, I'm probably getting 1000 gph. One union, one full port ball valve Union, 2x sweep 45*, 3x sweep 90* elbows.
 
I'm running a DCT15000, it is a 1.5" NPT, thus I used a 2" PVC female adaptor. I reduced this to 1.5" PVC to return to my 170G. At 2/10 flow rate selected, and a 4.5' head, I'm probably getting 1000 gph. One union, one full port ball valve Union, 2x sweep 45*, 3x sweep 90* elbows.

Interesting. The 12000 comes with a barb fitting that goes down to 3/4" or less I believe.
 
My dct 6k comes at 3/4 and 1 in. I would probably run the larger diameter on anything bigger.
 
What would be reasons to reduce the return from the original outlet diameter of the return pump? Dumb question perhaps, but I can understand doing this if you having multiple return loclines or for aesthetics to the tank? Coming from the pump I like to match the max size.
 
Honestly, I thought the DCT 15000 was a 1.5" threaded connection so I ordered all the fittings and expensive 1.5" cepex Union ball valve. So I just built it with what I had. In retrospective, I would have just plumbed it 2" all the way through. But, 1.5" is already a rather large pipe, 2" would look even bigger.
 
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So outlet on 15000 is 2"? Yes,that would be huge plumbing relative to the tank and flow. I would have done what you did with 1.5" too.
 
Yeah. I thought 1.5" NPT meant 1.5" PVC. Nope! There is a NPT conversion chart, 1.5" NPT equals 1.9" OD. I was able to screw on a 2" female/slip. I simple used a ABS street 90* elbow for my return, since my background is painted black, and past attempts with spray painting krylon fusion ended up with scuffed up paint.
 
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