jestep Posted September 30, 2013 Share Posted September 30, 2013 This durso looks like it's setup correctly but constantly gurgles. Not sure if the air hole is too small or my flow is too high. Noise level doesn't change if I cover the air hole. Straight drop directly into a filter sock. No bends at all. Running on a Eheim compact 2000+ pump. Just guessing, it's probably about 400 actual GPH. Quote Link to comment Share on other sites More sharing options...
Texasrob Posted September 30, 2013 Share Posted September 30, 2013 I had the same thing going on with mine last month. My air hole on top was clogged just needed to b cleaned off Quote Link to comment Share on other sites More sharing options...
jestep Posted September 30, 2013 Author Share Posted September 30, 2013 I had the same thing going on with mine last month. My air hole on top was clogged just needed to b cleaned off I did double check that it's not clogged but it isn't a very large hole. I haven't tried it yet, but I'm assuming that if I throttle the pump and the noise goes away it means the air hole is not large enough for the amount of flow. Quote Link to comment Share on other sites More sharing options...
victoly Posted September 30, 2013 Share Posted September 30, 2013 I'm no expert on the subject, but can't you add a valve to the top hole so that you can "tune" it? Quote Link to comment Share on other sites More sharing options...
+KimP Posted September 30, 2013 Share Posted September 30, 2013 Can you put some airline tubing in the hole? Then you can pull up or down on it until it quiets down. 1 Quote Link to comment Share on other sites More sharing options...
jestep Posted September 30, 2013 Author Share Posted September 30, 2013 Can you put some airline tubing in the hole? Then you can pull up or down on it until it quiets down. Possibly. I'm thinking it's too narrow right now since there's no change when I shut off the airflow completely, but it might be the right diameter to fit airline tubing directly in it. Quote Link to comment Share on other sites More sharing options...
victoly Posted September 30, 2013 Share Posted September 30, 2013 I've got a few different diameters for various projects, so if plain old airline doesnt work, let me know and I can help you out. Quote Link to comment Share on other sites More sharing options...
TheKipf Posted September 30, 2013 Share Posted September 30, 2013 This durso looks like it's setup correctly but constantly gurgles. Not sure if the air hole is too small or my flow is too high. Noise level doesn't change if I cover the air hole. Straight drop directly into a filter sock. No bends at all. Running on a Eheim compact 2000+ pump. Just guessing, it's probably about 400 actual GPH. When it gurgles does the water level in your overflow change - like drop suddenly? Also - that water line looks a lot lower then it does in my durso pipe. I'd suggest opening up more air to the pipe - especially because the noise 'doesn't change' if you plug it up. When working properly - if you plug the hole in your durso it should siphon water down to the bottom of that 90 degree elbow. Also - I'd look to drill several smaller holes instead of enlarging the existing hole. This helps to safeguard against something plugging up the hole and starving the pipe of any air. Quote Link to comment Share on other sites More sharing options...
TheKipf Posted September 30, 2013 Share Posted September 30, 2013 This durso looks like it's setup correctly but constantly gurgles. Not sure if the air hole is too small or my flow is too high. Noise level doesn't change if I cover the air hole. Straight drop directly into a filter sock. No bends at all. Running on a Eheim compact 2000+ pump. Just guessing, it's probably about 400 actual GPH. When it gurgles does the water level in your overflow change - like drop suddenly? Also - that water line looks a lot lower then it does in my durso pipe. I'd suggest opening up more air to the pipe - especially because the noise 'doesn't change' if you plug it up. When working properly - if you plug the hole in your durso it should siphon water down to the bottom of that 90 degree elbow. Also - I'd look to drill several smaller holes instead of enlarging the existing hole. This helps to safeguard against something plugging up the hole and starving the pipe of any air. Also - just from the pic - it looks like you have two different water lines in the over-flow. I'd say this is a solid indicator the air flow is not enough. Quote Link to comment Share on other sites More sharing options...
ckyuv Posted September 30, 2013 Share Posted September 30, 2013 You don't have enough air going into it, looks like you have a small siphon. I have the same one as you and when the water goes down to the holes on the left pipe it's because not enough air is going in through the top and it's making a suction. I made the top hole bigger and it's silent now Quote Link to comment Share on other sites More sharing options...
jestep Posted September 30, 2013 Author Share Posted September 30, 2013 Thanks everyone. I'll give the more airflow a try this afternoon. My previous overflows were horizontal and I had no problem keeping them completely silent. Quote Link to comment Share on other sites More sharing options...
jestep Posted October 1, 2013 Author Share Posted October 1, 2013 Still making noise after adding holes. Do you guys have the nozzle completely submerged in the sump? Seems like it might be an issue on the nozzle end. Quote Link to comment Share on other sites More sharing options...
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