Improving flow inside tank

[mindstate]

So I have an 8ft tank with sump where I did the plumbing myself and have 2 outflows (shown in blue below). The flow in the tank is decent but stagnates halfway on the return to the overflow. What can I change or add (like a flow pump or wavemaker) to pull the debris that settles on the ground up to the overflow and how to determine size?

Below is a sketch of the situation, the green line is the flow I'm happy with and where the sand is clean, starting from the orange line I notice debris settling instead of flowing to the overflow and the red line is barely no flow at all.



I'd like to add something like a powerhead or wavemaker, but not sure how to select the correct one, where to place it and how to determine capacity.

Any advice is appreciated!

 

[duanes]

Pump Angle: The Right Powerhead for the Right Flow, Used the Right Way – BRStv Investigates Flow.
I know this is designed for reefers, but lots of goodf info here

 

[mindstate]

Pump Angle: The Right Powerhead for the Right Flow, Used the Right Way – BRStv Investigates Flow.
I know this is designed for reefers, but lots of goodf info here

Thanks Duanes, thats part of my evening sorted.

 

[Backfromthedead]

I would try a couple things first before adding a wavemaker--you may nkt need them.

What i would try is crisscross the return nozzles towards the center of the tank, the one on the right shooting towards the bottom left corner, and the left one pointed sorta midway up towards the right side of the tank. This might not work unless you have some respectable flow through the returns, but it should create some random flow that will whip up the sediment throughout the bottom of the tank.

 

[mindstate]

I would try a couple things first before adding a wavemaker--you may nkt need them.

What i would try is crisscross the return nozzles towards the center of the tank, the one on the right shooting towards the bottom left corner, and the left one pointed sorta midway up towards the right side of the tank. This might not work unless you have some respectable flow through the returns, but it should create some random flow that will whip up the sediment throughout the bottom of the tank.

They are hard plumbed at the moment up to being horizontal to the water line, I could exchange the 90 degree elbow and play around with it for a bit. The outlets are 25 mm (1") at the moment and both pointed in the same directly and slightly tilted towards the surface in comparison to my sketch.

Regarding the pump its a Jecod DCP 8500 (2250 gallon per hour) connected to 32mm (1-1/4") pvc . Tank is 320 gallon.

 

[Backfromthedead]

They are hard plumbed at the moment up to being horizontal to the water line, I could exchange the 90 degree elbow and play around with it for a bit. The outlets are 25 mm (1") at the moment and both pointed in the same directly and slightly tilted towards the surface in comparison to my sketch.

Regarding the pump its a Jecod DCP 8500 (2250 gallon per hour) connected to 32mm (1-1/4") pvc . Tank is 320 gallon.

I see, IMHO that return pump alone will not provide enough flow through two nozzles in that tank to eliminate all your dead zones in that tank, even on full power. So the wave maker or maybe even a gyre pump might be necessary to do what you want. If you wanted to do this with just the return pumps you would probably need to reconfigure the overflow, sump, and pumps for considerably more flow.

My revised idea would be to pick up a gyre pump, just play with location and settings till you're satisfied. Even the budget gyre pumps move a ton of water.