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post #1 of 5 Old 12-21-2010, 02:53 AM Thread Starter
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lil question about my sump

ok iv been fghting with this for a while now and its starting to agervate me. i have a 75g tank with a 20g sump. everyday i add water that evaporates and always the same amount and everyday my mt wants to overflow and i have to make adjustments to the sump to stop that from hapening. what im not understanding is why when i add water to the sump dose it pump more to my mt. the pump is 1000gph and my overflow is out of the back of the tank with 2 1 inch outlets. so yeah i dont get it why dose the amount of water in my sump make my pump put more water into my mt. iv been thinking of upgradeing to a 40g sump but im afraid ill have the same issues. any help would be apreciated.
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post #2 of 5 Old 12-21-2010, 05:30 AM
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Originally Posted by bigrift View Post
ok iv been fghting with this for a while now and its starting to agervate me. i have a 75g tank with a 20g sump. everyday i add water that evaporates and always the same amount and everyday my mt wants to overflow and i have to make adjustments to the sump to stop that from hapening. what im not understanding is why when i add water to the sump dose it pump more to my mt. the pump is 1000gph and my overflow is out of the back of the tank with 2 1 inch outlets. so yeah i dont get it why dose the amount of water in my sump make my pump put more water into my mt. iv been thinking of upgradeing to a 40g sump but im afraid ill have the same issues. any help would be apreciated.

take a pic of the overflow system. how much water are you adding to the sump? what kind of adjustments are you making to the sump? overflows are usually rated for 750 gals/hour so first off, i think your return pump is too big. if i were to guess you are topping off a decent height of water because there is less head pressure on the pump when you add water ( water has to travel less distance away from gravity to the mt) causing more water to enter the main tank (pump not fighting against gravity to send it to the tank thus pump sending more water), and seeing that you are already over the rated amount of the overflow your water level in the tank rises. so to fix this you
1. either have to put pressure on the return pump
2. use a smaller return pump
3. add more hose to the return plumbing
4. lower the amount of water in the sump
5. put the sump lower than it is now.

100 Gal SPS Rimless, 2X250 Watt + 4T5's Giesemann infinity, Bubble King Mini 200 skimmer, Ca reactor, DIY Kalk Reactor. See my Reef aquarium in HD video http://www.fishtanks.net/fishtank.php?fishtank=2207.
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post #3 of 5 Old 12-21-2010, 08:10 PM Thread Starter
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i wish i could take a pic but yeah still having problems on that lol (long story) the overflow has duel outlets with 1 inch pvc. the teeth are a 1/4 inch apart on the overflow. amt i only keep 1 of the 2 outlets open cause if i run both to much water flows out vs in. the pump i have is 1000gph and with the 7 feet of tube i have now it should rate around 700gph acording to the manufactuer. i only add about 2 liters a day to the sump and it wont overflow my mt its when i add more than that to the sump it starts overflowing it (sorry should have been more clear on that).
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post #4 of 5 Old 12-21-2010, 08:53 PM
i'm surprised you are not having micro bubbles in the tank too! usually when you have alot of water flowing thru the sump you get micro bubbles especially if you have a protien skimmer in the sump. it makes no sense if you state that the water level stays constant but if you add to the sump it overflows. the way overflows work is by pumping water into the mt the level rises and overflows into the prefilter then to the sump. you should be able to reach an equalibrium with the water level flowing to the pre filter and it sounds like you did with little water in the sump. if you add more to the sump it shouldn't matter at all the sump should just end up with higher level water in it. are you shure it would overflow in the mt or are you just being careful? BTW is this a reef ready tank or are you using a HOB prefliter?

100 Gal SPS Rimless, 2X250 Watt + 4T5's Giesemann infinity, Bubble King Mini 200 skimmer, Ca reactor, DIY Kalk Reactor. See my Reef aquarium in HD video http://www.fishtanks.net/fishtank.php?fishtank=2207.
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post #5 of 5 Old 12-21-2010, 09:22 PM Thread Starter
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the overflow is attached to the tank with holes drilled threw the glass. i have a hob in the sump along with a protines skimmer but the hbo was only to introduce the bactieria from my 10g nano when i upgraded. im at a lost to cause i thought if i added more water to the sump it would just affect the lvl of water in the sump not the mt. but when i literly add 1 liter of water over what i normaly do and dont change a thing as far as valves or anything the mt will start to fill up over its brim and then i have to open the second outlet to keep that from happening.
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