Calculating flowrates

[Camps23]

I have a question on calculating water turnover. On my current 75g I run a low flow sump with a mag9.5 return pump. I have a ball valve installed in the outlet of the pump and it's throttled back to about 50%. On my new 155G I wanted run a low flow sump as well. How do you calculate what size return pump you would need. I will be running 2 1.5" drains with the herbie setup. I'm trying to see if the mag 9.5 will still be enough. I'm pumping up from my sump about 3ft. So I don't lose much head pressure.

 

[Hnguyen85]

If your having to throttle back about 50% with the 75g then I don't see a problem with the 155. Just try to open the ball valve up and see how well it does. If it isn't want your looking for then get a new pump. It's better that way then to buy a new pump now and come to realize you don't need it. Good luck


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[Camps23]

What is the recommend turnover rate ?

 

[Pallobi]

Typically, a low flow sump from what I understand, is about 2 to 3 times the total water volume of your system... your display's inner turnover, will be much more than this obviously... jmo

 

[Hnguyen85]

IMO and mines alone. I don't think turn over rates is hat important. As long as you have enough flow going through your sump for it to do it's job at filtering out your water then your fine. Let your power heads do the rest of the job at providing flow to your DT. I only have about a 3-4 times turn over rate on my 93 cube and I run 2 mp40w es. All my sps are happy and growing with great colors along with all my lps as well.


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[crvz]

I prefer something in the 5x display volume turnover in the sump. I ran a mag 9.5 on my 150 gallon in the past and was pleased, even though with loss it was a bit under that 5x number.

 

[mos90]

im flowing about 1000gph on my 125. mag 18 throttled back. then i use 2 korelia's 1000 and 1400 gph on 1 side of the tank and and an mp 40 at 60% on the other side. if i turn the mp 40 any higher i get a nice sand storm.