Newbie making first wet dry DIY - Page 2 - Tropical Fish Keeping - Aquarium fish care and resources

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post #11 of 25 Old 11-19-2010, 12:52 PM
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Originally Posted by bearwithfish View Post
what i have seen (again i do not use this so any one with experience please jump in here) drill a hole to fit the valve and ten super glue it in adding some silicone for added barrier... be sure that it is set to flow away from the PVC to let air out... not let air in or you will be sure to have issues
I have not done this type of project before, but it seems that this solution is very.. permanent? Supergluing would cause you to have to replace the entire valve along with the PVC that its glued to, which would be a lot of work if im not mistaken...
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post #12 of 25 Old 11-19-2010, 06:53 PM
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not so while superglue is a great bonding agent it is not permanent on PVC.. interestingly on PVC it will hold until a certain amount of pressure is applied then is will cleanly snap off... very odd but has worked on other PVC projects i have used it for...

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post #13 of 25 Old 11-22-2010, 11:24 AM Thread Starter
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i think my siphon sucks. i have have a piece of 3 inch abs that acts as an over flow. in side of in there is a 1.5 inch pvc that goes outside of the tank with two 90 elbows and goes straight down to the sump. I haven't filled the tank completely up so maybe there isn't enough water in the over flow to create a suction... i have an air line on top of the 90 elbows to prime it. i decided against the check valve. probably be a mistake but time will tell. the air lone is long enough i'll put it in the sater to keep the pressure.

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post #14 of 25 Old 11-22-2010, 12:02 PM
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is your design similar to this?? just asking to get a clear picture of the issue

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post #15 of 25 Old 11-22-2010, 05:08 PM Thread Starter
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it's at like1:50 in this movie..


i think i need something on the other end with water in it so balance the pressure

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post #16 of 25 Old 11-22-2010, 07:54 PM
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ok i see a few issues with this design
1st you would need to be sure that the siphon lines run into the over flow box and are actually under the water.. the movement of the water will draw off any air trapped up in the pipe itself... now that said with out a clear pipe on top its a lot of guess work to be sure te whole pipe is full
2nd (and the reason i would be most worried) as i watched that section the overflow in side the tank was creating a great deal of splash this brings a lot of air (bubbles) so you will likely have a lot of traffic in those air lines up top..

its workable but needs to be tweeked a a bit... perhaps drilling into the lower part of the over the wall pipes and inserting the air line there would creat enough drag to keep things flowing? hmmmm thoughts?

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post #17 of 25 Old 11-22-2010, 07:57 PM Thread Starter
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do i need that second over flow box? maybe i should go with a simpler design...

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post #18 of 25 Old 11-22-2010, 08:14 PM
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for that design i would say yes but we are dealing with a somewhat different set up.... i think its workable .. is there any way to contact the maker of the vid to ask for either more details or even a vid on how to make it?
other wise either google DIY overflow plans or you can youtube for that also to see some great builds and even get written plans free

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post #19 of 25 Old 11-22-2010, 08:51 PM Thread Starter
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i like the one on the video you showed me. it seems simple enough.

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post #20 of 25 Old 11-23-2010, 07:37 AM
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it is but needs a little tweeking to get it right . i never took the time and switched out to a traditional HOB overflow made from specimen containers...

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