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Old 02-09-2015, 05:16 AM   #11
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Originally Posted by alyxandria View Post
Ok I'm gonna take this a couple steps back and go back to the plumbing. I have a few questions.

Info: 75G tank, 40G sump

If I purchase the 1500 GPH overflow box kit here:

http://www.glass-holes.com/1500-gph-...-gh1500kit.htm

1) What thickness of PVC should I use? 1.5" right? That's what they're saying?

2) There are two drain lines, what is the point of this?? And they both go down to the same place in my sump?

2) I want to do my sump like this:



(Not really a question but unsure if it will help with answering my next question)

3) What kind of pump should I get and what GPH do I want the pump to be?

4) The plumbing going up the return will have a ball check valve with unions. (And the return pump will have unions too) do I use the same size PVC I used on the drain line?

5) If I wanted to put my overflow box in the middle (there's no centre brace) of the tank and one return line on each side - can I split the one return into two halfway up the PVC?

Ps. I really appreciate answers and fairly quick replies would be great. I'm trying to figure all of this out and my boyfriend just wants to put in a canister which I think is a no-no. So as long as I figure it all out he's ok with the sump. But he is also impatient and wants to get it set up lol.

1. Yes. 1.5"
2. For combined flow rate. 1 drain would be bigger, so they use 2. DONT JOIN THE DRAIN LINES
3. I would consider something in the mag 9 or 12 range.
4. Doesn't have to be same size. 3/4 or 1" are common
5. Yes

Personally I think your overflow baffles (the 3 where the water goes over them) are too high. You have very little room for extra water when the return pump stops. Probable sump overflow situation. Also your slimmer will need a serious lift to get to the proper water level. My sump is barely 1/2 full in normal conditions.


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Old 02-09-2015, 09:36 AM   #12
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75G Reef Tank Help

Quote:
Originally Posted by Ingy View Post
1. Yes. 1.5"
2. For combined flow rate. 1 drain would be bigger, so they use 2. DONT JOIN THE DRAIN LINES
3. I would consider something in the mag 9 or 12 range.
4. Doesn't have to be same size. 3/4 or 1" are common
5. Yes

Personally I think your overflow baffles (the 3 where the water goes over them) are too high. You have very little room for extra water when the return pump stops. Probable sump overflow situation. Also your slimmer will need a serious lift to get to the proper water level. My sump is barely 1/2 full in normal conditions.


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Thanks for the answers! Super helpful. That picture isn't mine (Google) it's just the general layout I wanted my baffles. Mine will not be that high.

One last question, do I need to worry about calculating GPH and how much I'm going to lose?

That's been the part keeping me from getting this done. (Never done this before) I'm worried that I may have too much flow and not enough power to bring it back and my sump will overflow or too little flow and too much power and my display will overflow? Will this work itself out?

Do I need to be super precise and calculate this to the dime (I don't even know how I'd do that lol) or is a "general idea" of how much GPH sufficient? And how do I even figure out my GPH loss?

Am I overthinking this? Lol
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Old 02-09-2015, 12:04 PM   #13
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the location of the inlet holes on the overflow box will determine the tank level. It will vary very slightly depending on what your return rate is, but not much. As long as the return is NOT greater than the overflow can handle, you'll be ok.
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Old 02-09-2015, 01:07 PM   #14
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Gph is pretty easy. Know what the gph of the overflow is. Then get a return pump rated higher than that. Then you put a ball valve on the return side of the pump to restrict the return flow to match.


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Old 02-09-2015, 01:56 PM   #15
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Personally I would not get a pump rated (after headloss) for more than the overflow. It just takes one forgetful water change or other pump maintenance and you forget to choke back the return enough. Then you sump is pumped out too fast and you run the risk of DT overflow or return pump burnout.


What is gained by having a bigger pump than your overflow can handle? If you have to run it restricted all the time, why not just buy the next sized down pump for less money?
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Old 02-09-2015, 02:09 PM   #16
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Once restricted you should never have to make any changes. Not sure where that idea is from. But this is so it matches right and restriction in such a manner can even be healthy for the pump.


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Old 02-09-2015, 02:33 PM   #17
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Quote:
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Gph is pretty easy. Know what the gph of the overflow is. Then get a return pump rated higher than that. Then you put a ball valve on the return side of the pump to restrict the return flow to match.


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This makes my life so much easier. I get where ingy is coming from but I think I can handle keeping the valve adjusted. Thanks guys
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Old 02-10-2015, 10:11 AM   #18
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Keep in mind, you cannot drill tempered glass as it will shatter.


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Old 02-10-2015, 10:52 AM   #19
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99% of the time only the bottom pane is tempered.
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Old 02-10-2015, 05:42 PM   #20
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75G Reef Tank Help

I'm 99% sure it's not tempered as I researched the tank and company so I think it'll be fine but thanks
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