i can not decide on a return pump.. any suggestion??

Sorry dude, Without punctuation I can't tell what u mean.



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I have a magdrive 750 gph with a 4 1/2 ft return on a 75 gallon with a 30 gallon sump and it still doesnt seem like enough for me. I went with the 10x your DT and should have went with a 1000-1200 gph pump. IMO if your overflow can handle it go with a few hundred gph more than your 10x rate.

Going with the 10x DT is what I have always heard and seems to be doing alright for me. But as I said, I think I would have been better off going with a bigger pump.

 

I am a huge fan of eheim and tunze pumps. They both run silent, cool, use low wattage, and low loss of head pressure. I have a tunze on my 15G frag tank and an eheim 1262 on my 75G.

Quiet One pumps are poorly made and many have had issues with the pump not restarting. I have had this issue with these pumps as well.

As for the Mag drives, I think they are noisy and run to hot. As well as not very energy efficient.

 

I'm going to have to disagree with several points here.... there is no such thing as a "turn over" rate for a marine sump. Turn over rate was a hold over from fresh water tanks and wet dry filters. Where as you wanted a certain display tank turn over per hour through the filter.... being a canister, wheel, or in our case a wet dry filter. Sumps are not filters and "require" no such rates of flow.

What flow rate you do need is what ever equipment you are supplying in your sump. If all you have is a fuge, then a very low rate is needed. If all you have is a heater and a bag of carbon, pick what ever rate keeps the tank warm. However, most sumps house a skimmer and that is what we need to supply.

There is no such "turnover" rate associated with any skimmer. Very few makers specify how much water through put they have. Some recomendations of air draw are around but are pretty broad. If you can find a flow rate for your skimmer then that is what you go by. If your skimmer only processes 300 gph... then flowing 600gph through your sump is a waste of power. Also if you are only giving it 200 gph then you are not skimming as well as you could.

So figure out what kind of flow you need for your skimmer and call it good. If you split your drains and supply a fuge add that in. If you want a bit more for giggles so be it. However, pumping more water than you need to is a big waste of power and a unecessary addition of heat.

Ehim is a good pump. Mags are solid but hot. Bubble Blaster from Reef Octopus has a return water pump. Guessing on a skimmer for a 240g tank I'm going to say you will need to be in the 600-900 gph range.

 

Ok Powerman, Point taken. "turnover" is the word i've been familiar with, but I agree "rate" is proper.

So, let's clarify, for a 240 gallon DT about 2200-2500 gph is a good rate via powerhheads plus the return pump's rate aswell.

A good rate for the sump would be +/- whatever your skimmer's gph is. Around 800 gph is about right.


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I didn't mean to be argumentative if I was.... Turnover rate is a common term used and understood for most. It's just not need for sumps.

Most folks are pretty good about the distinction between "tank" turn over and return flows. Tank turnover being how much circulation is in the display tank with closed loops and power heads. Providing tank circulation with a return pump is a very energy intensive way of doing it. Personally I never counted return flow in with tank circulation, but that is just me. No real reason.

Tank circulation can be anywhere from 10-40 times tank volume. Happy Reefing.

 

thanks everyone this is very helpfull.. i love this forum, since i joined i have learned a ton of stuff, ill look into these brands and try to decide what will work best for my setup.. thanks again everyone and ill still take suggestions.. the way my sump is i will need a in line pump, or i could plug the drain off of it. and do a submersible pump.. any comments on pos. or neg. of the two types will be helpfull to,, like i said i dont have any exp. with a return pump