DIY overflow not working right, suggestions? - The Planted Tank Forum
 
LinkBack Thread Tools Display Modes
post #1 of 12 (permalink) Old 03-18-2013, 01:50 AM Thread Starter
Wannabe Guru
 
SlammedDC2's Avatar
 
Join Date: Jun 2011
Location: Clarksville, TN
Posts: 1,574
DIY overflow not working right, suggestions?

I have a DIY 1" PVC overflow like this:
Well lately it has been loosing it's prime and causing the sump to go dry. I have an aqua lifter pump that doesn't seem to be working at all. As of lately it won't even prime the overflow when I turn power back on. I have the same aqua lifter on another setup and it works flawlessly.
I am having surgery this week and will be home for a while and want to rebuild or modify the overflow so that it works again. Any ideas?

55g turtle tank with a 20g sump.

Semper Fi
SlammedDC2 is offline  
Sponsored Links
Advertisement
 
post #2 of 12 (permalink) Old 03-18-2013, 01:58 AM
Planted Tank Guru
 
xmas_one's Avatar
 
Join Date: Feb 2010
Location: Long Beach, CA
Posts: 3,335
1" is kinda small. You either have a leak, or you need to bump it up to 1.5".
xmas_one is offline  
post #3 of 12 (permalink) Old 03-18-2013, 02:01 AM
Planted Member
 
Join Date: Feb 2013
Location: VA BCH
Posts: 235
You may be sucking air around the check valve tube, or the check valve is bad so it looses the prime.

29g Tetra Tank
100g Planted Angel/Clown Loach
I can't spell...Im an engineer, I do math
VAtanks is offline  
post #4 of 12 (permalink) Old 03-18-2013, 02:29 AM
Planted Tank Guru
 
Hoppy's Avatar
 
Join Date: Dec 2005
Location: Sacramento, CA
Posts: 19,943
When I used one of those I found that tiny air bubbles would collect in the outside "U" (upside down). As enough of those collected there they would finally be one big bubble big enough to break the siphon. I then had to restart it by connecting a water hose to the drain line outdoors, plugging the vertical vent pipe, then running a heavy flow of water to fill the whole thing with water again. Turn off the water, take the cap off the vertical drain, and it would start siphoning again. This happened about once a year. Mine was made of 1/2" CPVC pipe.

I believe this works much better if the outside "U" (upside down) is at the same height as the opening in the vertical drain pipe in the tank, or just slightly above it. Otherwise you can lose the siphon over the edge of the tank when the flow stops.

Hoppy
Hoppy is offline  
post #5 of 12 (permalink) Old 03-18-2013, 02:46 AM
Algae Grower
 
Join Date: Mar 2013
Location: Stratham nh
Posts: 92
My aqua lifter is prone to clogging unless u use thenprefilter which I broke. Keep an eye on the outflow of the aqua lifter and make sure it's working properly or itnwill keep losing siphon
Brich999 is offline  
post #6 of 12 (permalink) Old 03-18-2013, 05:42 PM Thread Starter
Wannabe Guru
 
SlammedDC2's Avatar
 
Join Date: Jun 2011
Location: Clarksville, TN
Posts: 1,574
Quote:
Originally Posted by xmas_one View Post
1" is kinda small. You either have a leak, or you need to bump it up to 1.5".
I have no leak, and the size is perfect for the flow I want. It ran for a year with zero problems.

Quote:
Originally Posted by VAtanks View Post
You may be sucking air around the check valve tube, or the check valve is bad so it looses the prime.
I never even thought about the check valve, I'll take a look.
[
QUOTE=Hoppy;2858114]When I used one of those I found that tiny air bubbles would collect in the outside "U" (upside down). As enough of those collected there they would finally be one big bubble big enough to break the siphon. I then had to restart it by connecting a water hose to the drain line outdoors, plugging the vertical vent pipe, then running a heavy flow of water to fill the whole thing with water again. Turn off the water, take the cap off the vertical drain, and it would start siphoning again. This happened about once a year. Mine was made of 1/2" CPVC pipe.

I believe this works much better if the outside "U" (upside down) is at the same height as the opening in the vertical drain pipe in the tank, or just slightly above it. Otherwise you can lose the siphon over the edge of the tank when the flow stops.[/QUOTE]
I'll check to see if that helps as well.

Quote:
Originally Posted by Brich999 View Post
My aqua lifter is prone to clogging unless u use thenprefilter which I broke. Keep an eye on the outflow of the aqua lifter and make sure it's working properly or itnwill keep losing siphon
I don't have a prefilter, nor did I know they had them. So far they still suck water great, but for some reason it doesn't seem to have the strength to reprime the 55g, my 125 has been up and running longer and never has a problem with the prime when I shut the power down. I will take a look at it either way, what is the best way to clean the aqua lifter?

Semper Fi
SlammedDC2 is offline  
post #7 of 12 (permalink) Old 03-18-2013, 08:49 PM
Planted Tank Guru
 
HD Blazingwolf's Avatar
 
Join Date: May 2011
Location: Chattanooga, TN
Posts: 4,907
replace the diaphragm in it its cheap and it adds a lot of umph back to one
alsoi stick a toothpick through the ends of any fitting in mine weekly. small snails like to get stuck.
HD Blazingwolf is offline  
post #8 of 12 (permalink) Old 03-18-2013, 09:33 PM
Planted Member
 
Join Date: Feb 2012
Location: San Jose, CA
Posts: 247
Send a message via AIM to jamesyu Send a message via Yahoo to jamesyu
I wish someone can give me a tutorial on this because I built one when I had a marine aquarium and it NEVER worked. well I can't say it never worked but it was loud as HELL!

so much gurglling, and the water level varied so much that I was afraid to leave it over night since it might flood. I could never get this to work out. anyone know how, please let me know.

mine was a 10 gal .75" into a 10 gallon sump. PVC cemented and added a aqualifter which was loud as hell as well.
jamesyu is offline  
post #9 of 12 (permalink) Old 03-18-2013, 10:04 PM
Planted Tank Guru
 
HD Blazingwolf's Avatar
 
Join Date: May 2011
Location: Chattanooga, TN
Posts: 4,907
Quote:
Originally Posted by jamesyu View Post
I wish someone can give me a tutorial on this because I built one when I had a marine aquarium and it NEVER worked. well I can't say it never worked but it was loud as HELL!

so much gurglling, and the water level varied so much that I was afraid to leave it over night since it might flood. I could never get this to work out. anyone know how, please let me know.

mine was a 10 gal .75" into a 10 gallon sump. PVC cemented and added a aqualifter which was loud as hell as well.
its about flow dnamics, and pressure equalization
drains suck in air. having enough room in the drain and a place for it to go make ALL the difference in the world

300 gph is max for a 3/4 inch pvc in a striaght run. bends and strainers/ adapters reduce this. there also needs to be a place where air can be either sucked in or vented out
smaller strainers sometimes come with this drilled on top where u can stick some rigid tubing down in it to find the sweet spot
HD Blazingwolf is offline  
post #10 of 12 (permalink) Old 03-19-2013, 02:47 AM Thread Starter
Wannabe Guru
 
SlammedDC2's Avatar
 
Join Date: Jun 2011
Location: Clarksville, TN
Posts: 1,574
I'll try the toothpick on it, thanks guys.

Semper Fi
SlammedDC2 is offline  
post #11 of 12 (permalink) Old 03-19-2013, 03:06 AM
Wannabe Guru
 
Join Date: Oct 2012
Location: denver Colorado
Posts: 1,006
would it work to put a toms aqualifter out put int the hole where the airline goes?
scotty b is offline  
post #12 of 12 (permalink) Old 03-19-2013, 11:15 PM
Planted Tank Guru
 
Hoppy's Avatar
 
Join Date: Dec 2005
Location: Sacramento, CA
Posts: 19,943


This is how I made my overflow. Note the water line. When the water stops flowing in the inlet to the overflow, there is still a siphon being maintained. But if air bubbles build up in the high point over the top of the tank it stops the siphon.

Hoppy
Hoppy is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the The Planted Tank Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome