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  #1  
Old 10/21/2007, 03:05 PM
SPSFiend SPSFiend is offline
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Need help calculating Sump size

I am beginning planning out an "In wall" tank build and I was wondering if anyone new of a calculation to determine the amount of water that drains from the tank when the return in off?

I am looking to setup a 360 G display tank (96L * 36W * 24H).

I want to be able to do about a 70 G water change without having to shut off the returns.

Thanks for the help!
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Thanks,

Gerry
  #2  
Old 10/21/2007, 04:07 PM
Elliott Elliott is offline
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http://reefcentral.com/calc/sump.php
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  #3  
Old 10/21/2007, 06:53 PM
Fish'InMN Fish'InMN is offline
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Or if you're not always at the computer, all dimensions in inches...

Volume (gallons) = Length * Width * Height / 231

As for the water change idea, why not have a bare 75 gallon tank plumbed in to your return manifold (assuming you're doing this) that is just extra water volume. When you want to do a water change, valve off the 75g tank, drain it, fill with SW, valve on, done. There are numerous folks who have done this here, though I cannot give you any specific threads/people.

Cheers,
Marty
  #4  
Old 10/21/2007, 07:12 PM
Elliott Elliott is offline
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As for the water change idea, why not have a bare 75 gallon tank plumbed in to your return manifold (assuming you're doing this) that is just extra water volume. When you want to do a water change, valve off the 75g tank, drain it, fill with SW, valve on, done. There are numerous folks who have done this here, though I cannot give you any specific threads/people.

that's exactly the way I do it, very simple and works great
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  #5  
Old 10/21/2007, 09:38 PM
SPSFiend SPSFiend is offline
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Thanks everyone!

If I end up having enough room for an extra 75G tank I will definitely do that as it sounds like an easy way to do water changes!
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Gerry
  #6  
Old 10/22/2007, 06:22 AM
Thinslis Thinslis is offline
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I wish I had thought of that extra tank idea. I used a 55g tank for my sump and can't do a 10g water change with out shutting pumps off =(

I supose I could still do it but it would be as clean as drilling the sump would have been.
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-B
  #7  
Old 10/22/2007, 08:23 AM
Elliott Elliott is offline
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Thinslis: you can still drain the sump, install bulkhead and refill
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