Help!! Noisy overflow

[amteo]

I've just installed a Durso extension to the existing overflow pipe. The water level of the overflow is constant, but its exit into the sump is noisy and there's a lot of bubbles. Is there anyway to make it less noisy and less bubbles?

[diabolus]

The sound is usually caused by the air thats coming down with the water from overflow into the sump.

u can install a ball valve to limit the amount of water flowing into ur sump.

used to be facing the same problem, but after adding in the ball valve, very quiet liaoz.

hope dis helps.

[Creetin]

The sound is usually caused by the air thats coming down with the water from overflow into the sump.

u can install a ball valve to limit the amount of water flowing into ur sump.

used to be facing the same problem, but after adding in the ball valve, very quiet liaoz.

hope dis helps.

if u regulate too low it kinda lowers the water turnover rate rite?

i choose to live with the noise...

[diabolus]

IMO...there should be a point where there is just the right amount of water flowing down and minimum air tagging along....

but dats my $0.02 worth lah.

[Gouldian]

Actually can just tie a filter bag with some filter wool to the exit to dissipate the bubbles. It is the bubbles bursting that causes the noise. Thus with the filter bag, you will notice it noise are be cut down significantly.

[riot]

It shouldnt affect the overall water flow. If it limits, then more water is being pumped back up and less water is going thru overflow, the water level in main tank will rise and eventually overflow.

You can try to restrict the ball valve, but the worry is if something jams in the piping plus the restriction, then bad stuff can happen.

Putting in a submerged t might be useful. Connect a t to your output, one end thru pvc pipe above the water level for the air to vent, the other submerged. It might help.

ref links here:

http://www.reefcentral.com/forums/showthre...=silencing+sump

[riot]

easy pix

[amteo]

Wow, thanks for the very fast replies.

I did not want to add a ball valve to the drain primarily because I wanted maximum turn over. Also, if 'Murphy' strikes and something becomes stuck and restricts the flow, it will be a problem.

As for the filter bag, it will be the last resort. I’m trying to minimize the maintenance required. Adding a filter bag will mean having to clean or change the bag periodically. Not for a lazy person like me!

I’m trying the ‘T’ method mentioned by Riot. So far limited success, but that is because I don’t have the correct parts, it is not set it up as it should be. The top of the ‘T’ is now about 2-4mm below the surface of the water. Hence, still got bubbles. Have to run to the shop to get a pipe extension to raise it about the surface to see if there is a further improvement. But, even with this set-up as it is, I can hear the improvements.

To side track a bit, with all the bubbles, can this become a Skimmer?

Thanks all for the wonderful feedback.

[Rocky99]

Wow, thanks for the very fast replies.

I did not want to add a ball valve to the drain primarily because I wanted maximum turn over.  Also, if 'Murphy' strikes and something becomes stuck and restricts the flow, it will be a problem.

As for the filter bag, it will be the last resort.  I’m trying to minimize the maintenance required.  Adding a filter bag will mean having to clean or change the bag periodically.  Not for a lazy person like me!

I’m trying the ‘T’ method mentioned by Riot. So far limited success, but that is because I don’t have the correct parts, it is not set it up as it should be.  The top of the ‘T’ is now about 2-4mm below the surface of the water.  Hence, still got bubbles.  Have to run to the shop to get a pipe extension to raise it about the surface to see if there is a further improvement.  But, even with this set-up as it is, I can hear the improvements.

To side track a bit, with all the bubbles, can this become a Skimmer? 

Thanks all for the wonderful feedback.

hi... the bubbles that come down are actually due to the mixing of air and water as water plunges down the bottom of box to go into the sump. by putting a valve at the end of the pipe will raise the water level in the overflow box and will shorten the distance that the overflowing water plunges and therefore reduce air/water mixing. as the water level rises, the pressure of water in the overflow box increases so that water that goes down the sump is still maintained at the original rate without the valve. therefore there will be no change in the rate of flow up and down. pls make sure your sump is deep enough to accomodate the extra column of water in case of power failure.

juz my 2cts