1 or 2 pumps?

[mobikobeyob]

I am converting from 2 submersible pumps to an external setup, due to heat issues.
I purchased two Iwaki WMD30RLXT pumps Rated at 960 GPH @ 4ft. They were originally intended to power each return on my 120g dual overflow w/1in drains. but now it seems like overkill, the drains are only rated at 600-700 gph, so I would have to slow the flow of both of the pumps. should I just install one pump with a tee in it and let it run full blast? or will that not give me enough turnover for a reef?
Confused, Mobi

 

[zafirablanca]

I have one pump with three overflows, with great results. If one pump is suffiecient, go with that. Using a ball valve to trim back a pump is clearly harder on the pump than having it function unobstructed. You got a nice pump, use it to its best potential.
I have a similar set-up (125g tank, 900 gph pump, 1" drain pipe overflows) and one pump was MORE than enough for the two overflows (HOB) I had. I ended up adding a third to directly supply a refugium, because I had enough flow to do it. I was still trimming back the pump with a ball valve with the two overflows. Now I leave it wide open. The pump keeps all three overflows working smoothly. Of course, trial and error with your own system is always the best determining factor.
Good Luck,
-Christine

 

[mobikobeyob]

Thanks for your input. I was thinking 2 pumps would be more heat as well. I think I will go with the one, and keep the second as a backup.

 

[zafirablanca]

Thats a really good plan. I should have a back-up pump..... Always more $$ isn't it?
Good Luck,
-Christine

 

[mobikobeyob]

You got it. BTW I think I own 2 of everything, just in case. lol
MOBI