Return Pump Question

[DPRINCE99]

I'm setting up a 55 gal. W/sump & 3/4" return line. My vertical head length is aprox. 5 ft. I would like to cycle system at lest 10x which means that I'm going to need a return pump to achieve at least 550 gph. Based on return line size & head length would I need the 634 gph. or the 792 gph. Tunze return pump? I need the pump to be as quite as possible & taking the least amount of energy to achieve @ least 550 gph. into display tank.
Sorry so wordy...
Thanks,
Dave

 

[shawnz28]

The 1073.04 will do about 400-450 at 5ft of head. More than enough turnover for a 55 for filtration purposes(I usually shoot for 4 to 6x) but not the 10x you are asking for.

 

[DPRINCE99]

Thanks Shawn,
I use 10x because that seems to be what is going around the forums that I visit. If I'm just as good @ 4x or 5x would I be better off with the 694 gph. pump? I'd rather have the smaller pump (ie. Cost less, quitter, less power to run) but I'm hoping not to have to add pump into the display tank to move water

 

[rvitko]

At 5ft the 1073.020 will only do about 200gph. Shawn is correct, filters typically work better with only about 4 time turnover, but when you consider the pumps get dirty, a 90 degree elbow is roughly equal to another foot of head, you will need the extra umph of the bigger pump.

You will absolutely need the added flow of pumps in the tank, while filters work best at 4-5 time turnover, the bare minimum for success with any marine life will be about 20* turnover in the tank and for many SPS that goes up to 50+ times turnover. There is no way around this besides a closed loop in addition to your sump filter. Putting so much flow through the sump will result in less efficient skimming and microbubble problems.

 

[DPRINCE99]

Thanks for helping me through this.
I will be getting the bigger pump!!!
Dave