Need Help with derso overflow Toilet noise

Tyler Roth · Jul 20, 2015

I cant seem to get the derso overflow to stop Sucking alot of water and making a Toilet Flushing noise can anyone help me i have extended it up and down and cant get it to be quiet!!! and stop Pulling alot of water and making a flushing sound!!

redfishbluefish · Jul 20, 2015

Sounds like you're getting a siphon going. Is the hole in the top open and big enough? And although you mentioned moving it up and down, it also sounds like it's too deep. I'd check the hole first.

Tyler Roth · Jul 20, 2015

redfishbluefish said:
Sounds like you're getting a siphon going. Is the hole in the top open and big enough? And although you mentioned moving it up and down, it also sounds like it's too deep. I'd check the hole first.

Yes this was a tank used by someone else it was used i baught it from him and but it back togetther and put water in the tank tonight so the derso overflow is made right i just cant seem to tune it or figure out why its keeps sucking water and then filling back up fast and then making a toilet flush noise!!

reefbeard · Jul 20, 2015

Tyler Roth said:
I cant seem to get the derso overflow to stop Sucking alot of water and making a Toilet Flushing noise can anyone help me i have extended it up and down and cant get it to be quiet!!! and stop Pulling alot of water and making a flushing sound!!

I have a 1/4" hole drilled in the top of the pipe with a 3" peice of airline tubing stuck in it. The tubing will muffle the water sound draining down the pipe and the hole will allow a continuous flow of water without the overflow filling up and flushing down the derso.

20 gallon nano · Jul 20, 2015

I don't use a dorsa drain, all I did is adjust the ball valve till I have a full siphon. And the water in the over flow stays level, it does drain slowly but as soon as it gets to the bottom of the over flow, it gugles and goes back up to the level.

20 gallon nano · Jul 20, 2015

The fifth one is my water line. But make sure the water level either stays the same or slowly drain to prevent over flow

reefbeard · Jul 20, 2015

You may need to slow down the drain of water a bit more to allow for the continuous siphon. It doesn't take much to alter the flow so try to make small incremental adjustments with the ball valve.

20 gallon nano · Jul 20, 2015

I tried my best to adjust it so it stays the same but had no luck. It either fills up or has a slow draining until it gets to the bottom then it goes right back up where it started in the beginning.

reefbeard · Jul 21, 2015

Paulbragin said:
I tried my best to adjust it so it stays the same but had no luck. It either fills up or has a slow draining until it gets to the bottom then it goes right back up where it started in the beginning.

Ball valves are used more for an on/off application and are difficult to tune properly. To really make precise flow adjustments I would suggest switching to a gate valve. This should allow you to dial in the correct drain flow and eliminate the flushing.

Amoo · Jul 21, 2015

As reefbeard suggested you should honestly consider switching to a gate valve. Ball valves are good in areas where you need on or off and the in between doesn't matter. Basically 1 turn or one half turn turns something on or off completely. Gate valves are what we use for precise control. It can take 15-20 turns with some valves to go from full open to full shut, but it allows for small adjustments the entire time. You'll possibly find yourself having to make small adjustments once a month or so anyways with that style drain (at least I do) and the darned thing will drive you absolutely mad if you don't just go ahead and make it easy on yourself from the start.

ReeferBob · Jul 21, 2015

It is too much return flow. You need to crank it back until it stops. And yes, it is feast or famine with this type of drain. To stop the flushing, it needs to be slower. Installing a larger air vent might help but changing over to a full siphon style drain is a better choice.

racin2438 · Jul 22, 2015

Just get a muffler Maggie from Aqua Cave.com. they are amazing

20 gallon nano · Jul 22, 2015

That sounds too good to be true, I wanna see it in action. Can u add a video?

jroescher · Jul 23, 2015

I'm not sure about having the airline tubing inside. I don't have that and don't have any issues with siphoning or flushing.

And I wouldn't do anything to restrict your drains. Any flow adjustments should be on the pump side.

CastAway · Jul 23, 2015

No valves on the drain to sump; danger danger. You want it unrestricted. You may need a larger throttle hole with an air valve to adjust air flow and prevent a syphon.