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Old 03-09-2016, 06:26 AM   #1
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Need Return Line Advice

I'm currently in the process of setting up a 75g saltwater tank with a 20g sump. I'll be running 2-3 power heads, proteins skimmer and a return pump that flows 950 gph. I was wondering what size return line I should use. At first I was thinking ¾" but now I'm not sure if I should go up to 1" or more. Any advice would be appreciated.
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Old 03-09-2016, 09:01 PM   #2
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I've always heard it's better to go bigger, so 1". Also depending on how many elbows and how far your line has to go you're not going to get 950gph.
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Old 03-09-2016, 11:29 PM   #3
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Vertical head loss is the most drastic. How much higher is the return?

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Old 03-10-2016, 01:49 AM   #4
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Quote:
Originally Posted by Jasonrusso View Post
Vertical head loss is the most drastic. How much higher is the return?

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The return to the top of the tank is about 4ft
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Old 03-10-2016, 09:10 AM   #5
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Then you'll lose quite a bit of pressure. Also hard plumb the return, much safer and less likely to blow. I've installed a flow restrictor and check valve on mine because it will drain the tank if it's return is underwater (and of course it will be)
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Old 03-10-2016, 09:48 AM   #6
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Read the flow charts. I have 2 expensive Eheim pumps. After 4 feet they are less than half of the zero foot flow rate.

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Old 03-10-2016, 10:52 AM   #7
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3/4" will give you a more powerful return stream, and 1" will give a less powerful stream, but both will handle whatever your pump can put out.
I have 3/4" return line that splits into two returns on my Jabeo 1600GPH pump and it works fine, but your pump is ~ 50% the rate of mine, so probably only one return.
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Old 03-10-2016, 11:33 AM   #8
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Thanks for all of the great information. What do I need in order to connect the once to the output in the pump
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Old 03-10-2016, 06:37 PM   #9
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I run a 1" return and a 1 1/2 " overflow I agree with PBSmith that a 3/4" return will give you a better flow , I'm working on down sizing myself ,
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Old 03-10-2016, 08:18 PM   #10
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Need Return Line Advice

I run a 1 1/2 drainand a 3/4 inch return on my 75g. My drain is flexible and I hard piped my return. You'll be looking at male and female threaded bits and pvc glue in order to seal it. My also 90 at two different places and I still have enough flow that it moved substrate
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