Gurgling noise in overflow box (the air intake hole of pipe # 2) -diagram included

marshallplacid

New Member
Hello fellow hobbyists.
I need some help and I hope anybody here can help me.
It is the very annoying LOUD gurgling noise problem with my overflow filtration system.
Tank specs:
187 gallons with one overflow into a sump with a 5 box type filter (a filter system with 5 separate compartments of water) with 2 drainage pipes
Pump is 900 GPH Einheim (spelling) pumping back out from one hose/pipe system.
FINDINGS: the gurgling noise is coming out of the air intake HOLE of pipe # 2 (see diagram below).
I attached a picture of the current configuration and some solutions I already tried including:
1- Attaching air intake hose (3 ft) into air intake hole for pipe # 2. Gurgling noise stops, but pipe 1 stops working, so the sump only has 1 pipe draining instead of 2 pipes (which is a requirement).
2- Lowering the ball valve so that only a little water flows out from the sump back into the tank. Gurgling noise stops. Both pipes 1 and 2 works and drains water. BUT, the pump is overtaxed because backward pressue is being forced back into the pump because the ball valve is almost 90% closed to only allow a little water back into the tank. This broke my first pump after 2 or 3 days. So, adjusting the ball valve does not solve the problem. It will only break the pump after a few days. Also, the GPH flowrate will be so low as to make the fish tank become unhealthy. I need at least a 4 or 5 times turnover rate for the fish tank filtration system.
What other solutions are there to this annoying problem?
I have tried asking my local saltwater fish store for help and the fish tank seller for help. No one has been able to help me. The manager of the store is on holiday, so I have to wait 2 weeks. I want to solve this problem now, with the help of this forum and the participants.
I sincerely appreciate any comments, help, or tips you can give me.
 

flower

Well-Known Member
Well I have a CPR overflow box and it has a piece of sponge as a filter before water goes down the pipe...when it is clogged and needs to be cleaned it makes a loud gurgling noise. So maybe your pipe is abstructed somehow (snail caught in the pipe) and sound is made as the water tries to flow over and around it.
 

marshallplacid

New Member
I have no animals inside the tank right now, so it would not be clogging problem, though in the future, I have your idea to keep in mind.
I only have had the tank for 1 week, and the gurgling noise started immediately after I filled up the tank.
Any other suggestions?
 

raptor72

Member
If you look up"gurgle" on this site, you might see a few threads on this. I also experienced this problem early on. It appears to be caused by not enough air going down the overflow pipe along with the flow of water. In other words there needs to be more airflow into the elbow "breather". I fixed mine by removing the small section of stiff airline on top of the elbow and replacing it with one of a slightly larger diameter. Someone else on here said they installed some type of air valve to make it adjustable. I also had his problem on just on side of my tank.
 
S

saxman

Guest
We typically drill a hole and shove a plastic air valve into it (must fit tightly), then you can 'tune' the amount of venting. Sometimes you need multiple holes to tune the standpipe, which I prefer to enlarging the hole because they're easier to plug if you ever need to "re-tune" the pipe.
You can also drill a 3/16" hole, shove a short piece (maybe an inch or so) of rigid airline into it and add a piece of airline hose and a valve to make it easier to get to if need be.
 

java1

Member

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