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Old 03-05-2007, 11:44 AM   #1
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Water turnover rate

I am installing a new sump in the basement and pump the water to the first floor. I am using Gen-X PCX70HP external pump and it looks like it is pushing too much water to my tank, more than the overflow can handle. The water comes dangerously close to the top edge of the display tank.

a) How can I salvage the situation? Should I try to reduce the flow coming in
(by closing in the ball valve) or increase the flow that goes out or both? and how?

b) What is the ideal turnover in the display tank? How much is too much?

Any help is appreciated.
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Old 03-05-2007, 12:19 PM   #2
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I would use a ball valve to turn down the flow out of the pump. You really cant increase the flow out of the tank because the overflows can only accept so much water, it can't be increased.
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Old 03-05-2007, 12:49 PM   #3
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i had the same problem. ball valve worked great.
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Old 03-05-2007, 12:49 PM   #4
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Most external pumps can handle a little back pressure so if you don't have to restrict the flow too much using your ball valve then that is the easiest solution.

The best option is to T off the return to go back into the sump (also using ball valves) and divert the excess flow not needed back into the sump to keep from putting any back pressure on your pump.

Turnover rates vary depending on type of tank i.e. FO/FOWLR/REEF but if not a reef tank I'd strive for a 15-20 times turnover. If it is a reef tank then flow will be more dictated by the types of corals you have.
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Old 03-05-2007, 02:05 PM   #5
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It is a fowlr now, but will be a reef hopefully soon. Mine is a 72 gallon and the pump based on the head loss calc in reef central, seems to be pushing at about 1000 gallons about an hour. I guess I am pretty close.

T-eeing the excess water back to the sump is a good idea, although I would hate to cut the pipe again. But thats what I said the last 15 times or so...

One another question that I have is that the pump seem to be putting tonnes of micro bubbles in the display tank. I noticed there were leaks in two places in the plumbing. I am going to seal them with teflon and run the pump again to test.

Can there be any other reason other than the leaks, that would cause microbubbles? I dont see any bubbles in the sump.
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Old 03-05-2007, 02:31 PM   #6
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Since you don't see any bubbles in the sump (I assume you have quite a few baffles) then it could be coming from a small hole sucking in air on your pump but with that many GPH going through your plumbing I think you would notice any holes in your plumbing pretty quickly by water shooting out 8O
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Old 03-05-2007, 02:40 PM   #7
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What kind of plumbing are you using that needs teflon tape?
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Old 03-05-2007, 02:48 PM   #8
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Quote:
Originally Posted by tecwzrd
Since you don't see any bubbles in the sump (I assume you have quite a few baffles) then it could be coming from a small hole sucking in air on your pump but with that many GPH going through your plumbing I think you would notice any holes in your plumbing pretty quickly by water shooting out 8O
Yes. It is leaking in two places pretty big.

Quote:
Originally Posted by Ziggy953
What kind of plumbing are you using that needs teflon tape?
I use PVC pipes. The inlet thread & outlet thread of the pump. The pump uses 1" outlet, I raise it to 1.5" right after the pump run through the ceiling and then right before the tank I reduce it from 1.5" to .75". I have two or three threaded components where I reduce the size near the tank. It leaks there too.
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Old 03-05-2007, 02:56 PM   #9
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That's what I thought just checking...I solved that problem on my tank with lots of teflon tape....LOTS PVC doesn't like to seal on it's self and it take a lot of teflon tape to get it to work....or you could go with the fittings that have gaskets in them. I would consider that with the amount of water flow you pump moves!!!
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Old 03-05-2007, 03:03 PM   #10
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Any loose seals or connections that are not 100% airtight can admit air which causes microbubbles and troubleshooting can be quite difficult with that many pipes/fittings.

Hopefully you will be able to plug all the leaks.
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