Pump dilemma

[rsach]

The Mag7 pump that came with my 55g cube/15g sump was running intermittently so I decided to get Jebao based on recommendation. I got DCP-6500 (1710gph) which was an overkill and was causing this flushing effect in the overflow. So I switched it with DCP-3500(925gph), even this one is doing the same unless I have the power down to 30% and the return valve half ways shut. Is Jebao just not compatible with my sump? Should I go for smaller pump? I got replacement parts for Mag7, it is noisy.

 

[Doctorgori]

Can you Tee off the extra flowinto a reactor or perhaps a squid ?

 

[rsach]

I do have a phosban 150, the guy who I bought the aquarium from gave me. Would it be something good to use. Would this 925gph pump be able to handle both?

 

[homer1475]

Not sure what the problem is here?

Turning the pump down is going to increase the longevity of the pump, and closing the valve 30% is also no big deal, it's the entire reason it's there. So either roll with it(I would), or buy a bigger pump(On that note you really don't need a huge turn over rate between the sump and display).

I have to close my siphon valve nearly 80%(oversized plumbing and small pump) to keep it in tune with the return.

 

[rsach]

Got it. I read some comments in a different forum that reducing the output stresses the pump so was worried.

 

[eggplantparrot]

I think your overflow is a big bottleneck here.

I have the DCP-3000 on a 14G tank with 10G sump, i do have it dialed down to 30% but the overflow can handle more if i wanted, with the gate valve fairly closed.

what overflow do you have?

 

[rsach]

I think your overflow is a big bottleneck here.

I have the DCP-3000 on a 14G tank with 10G sump, i do have it dialed down to 30% but the overflow can handle more if i wanted, with the gate valve fairly closed.

what overflow do you have?

It's a durso overflow. With power at 30% and the return valve at 50% it works fine. I guess I can utilize rest of the power for a reactor. Thinking of returning the 6500 and keeping the 3500, makes sense right?