How To Silent External Overflow

[ether]

I think you've nailed the problems. You can raise the water level in the box which should lower noise there, but it makes me nervous too having the water that close to the top. If you can swap out for a modular marine box (holes and sizes would have to line up) you could fix that problem. I think their design is better. You can do this without closing off the main flow more by just raising the level of the secondary drain. Mine is just an open top pipe (just like your emergency drain) and I hear almost nothing with the lid on.

To fix the noise to your sump from your secondary flow, you need to open the main drain more so that barely any water goes through the secondary drain. GL!

 

[Aaron-A2]

I think you've nailed the problems. You can raise the water level in the box which should lower noise there, but it makes me nervous too having the water that close to the top. If you can swap out for a modular marine box (holes and sizes would have to line up) you could fix that problem. I think their design is better. You can do this without closing off the main flow more by just raising the level of the secondary drain. Mine is just an open top pipe (just like your emergency drain) and I hear almost nothing with the lid on.

To fix the noise to your sump from your secondary flow, you need to open the main drain more so that barely any water goes through the secondary drain. GL!

How does the modular marine system work? Would it allow me to use the same drilled holes I have today?

 

[ether]

How does the modular marine system work? Would it allow me to use the same drilled holes I have today?

Hope it's ok to post a link here: https://modularmarine.com/collectio...-low-profile-overflow-box-with-removable-weir

I have no relationship with them, just like their products. The outside box is the same height as the inside box, so water level can be a little higher. I don't know if you'd be able to use the same holes. You'd have to measure yours and email to see if the MM holes are the same. Long shot, but might be worth it.

 

[Aaron-A2]

I sent them an email to ask if they can accommodate the eshopps inner bulkheads and drain lines. Probably be a custom job. Thanks for the tip my friend.

 

[Scott Hawaii]

There should be a faint trickle of water going down the secondary.

 

[Scott Hawaii]

I have a bean animal. The secondary should only be a faint or intermittent trickle of water.

 

[Wiser]

Try removing the 90s on the drain lines. Go straight pipes like your emergency.

The main drain should be completely submerged. Try throttling this drain so it trickles over the 2nd drain.

The second drain should be high enough that the water isn’t falling to far into the box causing noise and a very small trickle so no noise falling down the pipe.

The emergency should be close to the top of the overflow box but not high enough to flood lol.

It took me a long time to get this figured out but it is dead silent.

 

[Wiser]

Try removing the 90s on the drain lines. Go straight pipes like your emergency.

The main drain should be completely submerged. Try throttling this drain so it trickles over the 2nd drain.

The second drain should be high enough that the water isn’t falling to far into the box causing noise and a very small trickle so no noise falling down the pipe.

The emergency should be close to the top of the overflow box but not high enough to flood lol.

It took me a long time to get this figured out.

 

[Javamahn]

http://exoticmarinesystems.com otherwise reduce the flow from the pump to reduce the noise

 

[Kev Smith]

Just a comment, but your secondary drain top appears to be a little high. The hole on the 90’s looks to be at the same height as your emergency. This would mean that these would operate at the same time. Previous comment rightl suggested that your emergency should be high in the overflow to capture issues with primary and secondary drains. I would also recommend a drain cover on the primary to minimize debris from including CUC and fish causing a potential blockage.

 

[Master of Cloak]

Did you ever get the box silent? I have the same one and can’t seem to get it quiet.

 

[dohc97]

Try removing the 90s on the drain lines. Go straight pipes like your emergency.

The main drain should be completely submerged. Try throttling this drain so it trickles over the 2nd drain.

The second drain should be high enough that the water isn’t falling to far into the box causing noise and a very small trickle so no noise falling down the pipe.

The emergency should be close to the top of the overflow box but not high enough to flood lol.

It took me a long time to get this figured out.

thank you for that, i cut new longer secondary and emergency drain pipes, simulated a clog on primary and secondary and watched the emergency handle the water right about to the top but without flooding. i think it helps that i am not running a big return pump so velocity of rushing water into box is pretty low so i do not have a tornado of water going down emergency. my noisy weir is 90% quieter now.

 

[Snoopy 67]

I have 2 overflow boxes that made noise from water falling into the boxes.
I made a piece to fit inside on an angle to catch the water & direct it towards the inside wall.
Takes a little fiddling but the boxes are silent now.

 

[dohc97]

I have 2 overflow boxes that made noise from water falling into the boxes.
I made a piece to fit inside on an angle to catch the water & direct it towards the inside wall.
Takes a little fiddling but the boxes are silent now.

that is exactly what i was thinking of doing until i just went ahead and tried raising water level and see if i could get it reasonably quiet, im ok with where it is now so ill just let it go.

 

[Oldcoder]

Okay I have the same overflow and had the same problem. I did the following.
1. Used the 90 degree bend only on the main siphon.
2. the secondary is a straight pipe set just below the height of the red emergency pipe.
3. Set the speed on your return pump so the water rises above the teeth only 1/4 to 3/8 inch.
4. Now tune the main siphon so that the water only trickles down the secondary. You will hear the trickle but not to bad.
5. There will still be the noise of both the trickle and the water cascading over the wier, annoying but not that bad.
6. I purchased a wide mesh from aqua cave forgot what it is called. It has about 3/8 to half inch holes in it. I filled the interior overflow with the mesh it quiets the weir overflow to some extent. I pull the mesh every six month and check never been clogged.
Not a perfect solution there is still noise sounds like a small fountain. For what it is worth I have been happy kind of a soothing noise. This gave me a flow rate of 5 to 6 hundred gallons an hour as close as I could measure with a bucket.
Good luck

 

[dohc97]

Okay I have the same overflow and had the same problem. I did the following.
1. Used the 90 degree bend only on the main siphon.
2. the secondary is a straight pipe set just below the height of the red emergency pipe.
3. Set the speed on your return pump so the water rises above the teeth only 1/4 to 3/8 inch.
4. Now tune the main siphon so that the water only trickles down the secondary. You will hear the trickle but not to bad.
5. There will still be the noise of both the trickle and the water cascading over the wier, annoying but not that bad.
6. I purchased a wide mesh from aqua cave forgot what it is called. It has about 3/8 to half inch holes in it. I filled the interior overflow with the mesh it quiets the weir overflow to some extent. I pull the mesh every six month and check never been clogged.
Not a perfect solution there is still noise sounds like a small fountain. For what it is worth I have been happy kind of a soothing noise. This gave me a flow rate of 5 to 6 hundred gallons an hour as close as I could measure with a bucket.
Good luck

I got mine similar:

elbow on primary drain only
secondary-open pipe, level is just at the top of bulkhead between tank and overflow box.
emergency-open pipe, set about half an inch over secondary

simulating a clog of both primary and secondary i have just enough room in the box to deal with water before it goes down the emergency. mine is pretty quiet, just a small trickle from time to time.