Overflow makes a grumbling sound

[Holyreeftankaquaman]

I made an over flow following YouTube. it works really well except it makes a constant grumbling sound. the flow is good but at a constant interval a large bubble will come out. it like a giant fart in water.

what could be the problem?

 

[Seanb1]

You probably need a gate valve on it.
You should post pics so everyone can see what you have available for upgrade or changes.

 

[Ratherbeflyen]

Best guess is the drain/plumbing has a section that travels up hill trapping air until it goes full siphon pulling the bubble out until it rebuilds again.

Like seanb1 said, without a picture, its just a shot in the dark.

 

[Reef-junky]

Let me guess PVC? Those are junk. I wouldn’t put a valve on it unless it’s a bean animal or herbie overflow. To put a valve on this type of overflow is asking for a flood all over your floor. Your problem is not enough air flow in the pipe. You also need the pipe in the sump to be slightly underwater and stay underwater.

 

[Reef-junky]

Do your self a favor and get rid of that thing. Drill the tank and put in a bean animal or herbie overflow.

https://blog.marinedepot.com/education-center/charts-diagrams/durso-herbie-bean-animal-overflow

 

[Holyreeftankaquaman]

I can't drill because my tank is already set up. i did this because i read i could use algae in the sump to eat up all the nitrates and phosphates. i left it running overnight and the grumbling noise stopped. I am afraid of some sort of failure as well. i unplugged it a couple times and the sump seems to handled any excess water and the overflow does stop.

 

[Reef-junky]

A HOB overflow would be more reliable then what you have.

 

[Bigtrout]

A HOB overflow would be more reliable then what you have.

Do what I did in my FW planted 75 gallon. Buy a HOB with 2 drain bulkheads. I used an eshoppes pf-1200 and set it up with a herbie. Very quiet and reliable so far!