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Old 03-05-2007, 03:19 PM   #11
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The thing is I have leaks only where there is a threaded fitting. I tried to avoid the threads wherever possible;

Looks like both of you seem to imply that 1000 gph is a lot??? When you say shoot for 15-20 times of the volume, being my tanks is 72g, I thought 72g*15 about 1000 gallons, right? Is it not a reasonable flow?

This 1000 gph estimate is based on the reef central head loss calc, based on an equivalent pump. So in reality the flow would be more or less.
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Old 03-05-2007, 04:42 PM   #12
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Old 03-05-2007, 05:09 PM   #13
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15-20 times turnover is recommended for good circulation/oxygen exchange but it doesn't have to be all done in the sump. It can also be done using a couple of power heads or a closed loop system.

Not that other people haven't had that kind of flow through there sumps but typically they have multiple overflows and 125+ gal tanks.

Tank size isn't as important as making all seals airtight.
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Old 03-12-2007, 09:46 PM   #14
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Thanks for the suggestion, I added another pipe to divert some water back to the sump. This reduced some water flow in the display tank.

Even after diverting some water, the flow is apparently too much, and I have a non-stop sand storm in my display tank. What are my options now?

Pl. help.
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Old 03-12-2007, 09:49 PM   #15
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Smaller pump or more water diverted to the sump. Are all your returns at the surface? How many do you have split for returns to the tank?
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Old 03-12-2007, 10:04 PM   #16
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The returns are split into two and they both are on the surface.

Also, If I increase the water flow that is returned to the sump, that creates a lot of bubbles in the sump.
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Old 03-12-2007, 10:54 PM   #17
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Your pump is pumping more water into your tank than what is coming in through the overflow. You want to try and match the two rates (overflow and pump) as closely as possible. Find what your overflow is rated for and try to match it with a pump that will return that volume. If you don't want to get a new tank then what you need to do is divert the some of the water so that it doesn't go into the tank as quickly as it leaves. As mentioned above you can divert some water back into the sump. If this isn't enough then you need to divert more. You could add another line back into the sump but ultimately it sounds like your pump is too strong for you overflow. You might also try to include as many elbow and tees into your plumbing to decrease the rate. I'm not sure how much each decreases but there are calculators that can help.
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