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Old 01-25-2013, 05:14 PM   #11
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oh... I saw 25L and was thinking 25 long lol. Thats a weird shape for sump... must have been a HOB fuge or something.... unless he is just building it like this?

Note to self: Read the whole post before posting haha.
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Old 01-25-2013, 05:44 PM   #12
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Chris, you certainly started a conversation.

I had a 30 gal with a hob skimmer/refugium very similar to the one you are designing. If a true sump is out of the question , as it was for me, then I only see 1 critical flaw in the design. If your return pump fails (power outage) you have very little volume before your sump overflows. I would raise the whole sump system so the top of the sump is at or very slightly above your DT waterline. Under normal operation you sump water level would still be below the tank level for a normal syphon.

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Old 01-25-2013, 08:26 PM   #13
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I am doing it so narrow do to it sitting behind the tank. Here is a picture of the stand it will be on and some pictures of a cardboard mockup. There is a 20x7x4 space for the water to rise in case of power outage. Which i think is 2.4243 gallons of overflow space.
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Old 01-25-2013, 09:44 PM   #14
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If I have the overflow 1 inch in the tank and everything shuts down there is there will be 434 cubic inches which would be 1.87 gallons draining into the sump.
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Old 01-25-2013, 10:08 PM   #15
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How did you come to that conclusion?
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Old 01-25-2013, 11:22 PM   #16
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This is a scaled down drawing of the top of the main tank. With the over flow boxes teeth lowest point 1 inch under water that mean no more then 1 inch of water can come out. Then figure how many cubic inches the tank is in layers or as a flat image and you come up with this drawing. Which with my tank being a bow front its a little more figuring but with a 1inch grid it can be done pretty easy. Count the squares and that will give you the cubic inches of on layer which for mine its 425 cubic inches then divide that by 231 which is how many cubic inches are in a gallon of water which in my case is 1.839 gallons

My tank is 21inchs high so if you take 425 times 21 it gives you 8925 thatís how many cubic inches are in my tank. Then is you divide 8925 by 231 that equals 38.6363 which my tank is only 36 gallons so it will be a little less then the 1.839. Its a little over do to I measured the top plastic ring not the inside of the tank
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Old 01-26-2013, 12:17 AM   #17
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Your return hose cannot be more than 1" under the water as well. Otherwise once the pump shuts off it will back syphon into the return as well.
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Old 01-26-2013, 12:32 AM   #18
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I was going put a check valve on the return. So the water cant run back into the sump.
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Old 01-26-2013, 01:57 AM   #19
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Don't rely on a check cable to stop a flood. Algae can build up in them and cause them to leak. If the level I'd critical even a slow leak can cause a disaster
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Old 01-26-2013, 10:11 AM   #20
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...and that's what I was going to say next. You will need a siphon break just under the water line. I usually drill a small hole in the return just under the water line.
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