reef Posted September 8, 2006 Report Share Posted September 8, 2006 better than a durso OR a standpipe I think you will find that durso stand pipes are loud because they are not put in correctly. If I can get mine silent then every else should be able to. I have a tap on mine so i can adjust the flow, once set i have never had to adjust it. Quote Link to comment Share on other sites More sharing options...
chimera Posted September 8, 2006 Report Share Posted September 8, 2006 Kyle and Chimera - What do you think? clever. i'm still going to invent something myself, mixture of the two but never needs adjusting, never gurgles and is completely silent i know it can be done! Quote Link to comment Share on other sites More sharing options...
lduncan Posted September 8, 2006 Report Share Posted September 8, 2006 Been done. It's called a full siphon These overflow designs, including this Hofer one, are all unnecessarily complex. It's clearly been influenced by the durso, a derivative to try and solve some of the problems the durso has. In reality, It's a pretty simple design problem. Air in the overflow causes noise. How do you stop the noise? Easy eliminate the air from the overflow. Unfortunately these designs don't do that. Layton Quote Link to comment Share on other sites More sharing options...
reef Posted September 8, 2006 Report Share Posted September 8, 2006 Easy eliminate the air from the overflow. Unfortunately these designs don't do that. You can stop the noise and the bubbles by having a tap after the durso. as i said i dont have any noise or excess bubbles. it is dead silent. Quote Link to comment Share on other sites More sharing options...
lduncan Posted September 8, 2006 Report Share Posted September 8, 2006 Having a tap on the return pipe effectively turns a durso into a full siphon. Quote Link to comment Share on other sites More sharing options...
reef Posted September 8, 2006 Report Share Posted September 8, 2006 call it the dursotap system then. works great. Quote Link to comment Share on other sites More sharing options...
tel Posted September 8, 2006 Report Share Posted September 8, 2006 isnt reef talking about a tap on the durso, not the return? i have a tap on the bottom of the tank, directly on the base of the durso. i can adjust the flow to make it silent, however if i turn the return pump off and on again (a power cut) the restriction will cause an overflow as there isnt enough spare margin to self adjust within the flow rate of the now restricted durso. Quote Link to comment Share on other sites More sharing options...
reef Posted September 8, 2006 Report Share Posted September 8, 2006 we have many power cuts in the bush and it has never overflowed. I do have two overflows with 25mm pipe durso. so that might stop the overflow as it can handle far more flow that what it is getting, Quote Link to comment Share on other sites More sharing options...
lduncan Posted September 8, 2006 Report Share Posted September 8, 2006 isnt reef talking about a tap on the durso, not the return? i have a tap on the bottom of the tank, directly on the base of the durso. i can adjust the flow to make it silent, however if i turn the return pump off and on again (a power cut) the restriction will cause an overflow as there isnt enough spare margin to self adjust within the flow rate of the now restricted durso. ... by having a tap after the durso. I assumed that meant a tap on the return as opposed to a tap adjusting airflow. If you just remove the durso "head" plumbing you won't have that problem. It sounds like your trying to run a durso as full siphon to eliminate noise which comes with the original durso design. But then the durso head plumbing is getting in the way of the full siphon operation after a power outage etc. Get rid of the durso head and you'll be right. Either that or run the durso as designed. Layton Quote Link to comment Share on other sites More sharing options...
reef Posted September 8, 2006 Report Share Posted September 8, 2006 assumed that meant a tap on the return as opposed to a tap adjusting airflow I mean a tap on the return to the sump. ball valve. i dont have a airflow tap, just a small 1mm hole. Quote Link to comment Share on other sites More sharing options...
wasp Posted September 8, 2006 Report Share Posted September 8, 2006 Either that or run the durso as designed. Layton Nah. Hofer Gurgle Buster's all the way!! Quote Link to comment Share on other sites More sharing options...
lduncan Posted September 8, 2006 Report Share Posted September 8, 2006 What ever happened to keeping things simple. :lol: Quote Link to comment Share on other sites More sharing options...
Ira Posted September 8, 2006 Author Report Share Posted September 8, 2006 *Snicker* (Yeah, I know, I'm probably not the first to do this...) Quote Link to comment Share on other sites More sharing options...
chimera Posted September 8, 2006 Report Share Posted September 8, 2006 What ever happened to keeping things simple :roll: plumbing is not complex, even those previous designs are not complex. if it takes half a day to make a (what layton might call a "complex") overflow system that is both full safe and completely quiet, then surely doing that for a tank that could be running for 10+ years is not really that bigger deal?!! i do agree, simple is good. but those designs are not exactly rocket science Quote Link to comment Share on other sites More sharing options...
lduncan Posted September 8, 2006 Report Share Posted September 8, 2006 Not complex to make no. But the reason behind how they work is actually pretty complex, far more complex than a full siphon. Calling a durso full safe is just being deluded, it is not. And clearly for some people isn't quiet enough... otherwise they wouldn't go to the extent of trying to make modifications to make it more quiet. Layton Quote Link to comment Share on other sites More sharing options...
chimera Posted September 8, 2006 Report Share Posted September 8, 2006 any reason why this wouldn't work? kind of like an upside down durso but without the requirement of air, so sort of full syphon but without the tap? obviously means you have to get the hole drilled in the top at the right level so water doesnt drop off the overflow too far and not too high that it sits higher than the tank water level Quote Link to comment Share on other sites More sharing options...
reef Posted September 8, 2006 Report Share Posted September 8, 2006 wont work. will lose its syphon. water will then go up above the comb and it might then get it back. Quote Link to comment Share on other sites More sharing options...
chimera Posted September 8, 2006 Report Share Posted September 8, 2006 actually, its not even a syphon, it doesnt suck water down, it flows to the level of the upside down U pipe Quote Link to comment Share on other sites More sharing options...
reef Posted September 8, 2006 Report Share Posted September 8, 2006 i still doubt it will work as it will then get a syphon and then stop. Then again it might work if you use 100mm piping Quote Link to comment Share on other sites More sharing options...
chimera Posted September 8, 2006 Report Share Posted September 8, 2006 works much like any typical basin or bath plug does, except that in this case the inlet is below the U section. since it's submerged so deep, it shouldn't cause the "whirlpool" effect. not sure if it would still surge though? cant see how it would if there was no air - unless it got air coming back up from the sump end? ah it's all in theory, personally i wouldnt know til i tried it out just trying to get some feedback to know whether its worth attempting or not same as any other design in terms of blockage though, snail gets in overflow floods Quote Link to comment Share on other sites More sharing options...
Ira Posted September 8, 2006 Author Report Share Posted September 8, 2006 Yeah, eventually you'd end up with a siphon which would drain the overflow box all the way down to the inlet and then lose the siphon. Unless you put an air valve or hole in the top of the U to let air in which kinda defeats the purpose.... Quote Link to comment Share on other sites More sharing options...
reef Posted September 8, 2006 Report Share Posted September 8, 2006 it will syphom the water in the overflow. wont work Quote Link to comment Share on other sites More sharing options...
reef Posted September 8, 2006 Report Share Posted September 8, 2006 both post at 11.46am Quote Link to comment Share on other sites More sharing options...
chimera Posted September 8, 2006 Report Share Posted September 8, 2006 Yeah, eventually you'd end up with a siphon which would drain the overflow box all the way down to the inlet and then lose the siphon rubbish. that is completely impossible. how can it suck water down to the inlet? the water level in the overflow MUST be a minimum of the U bend - it has no where else to go otherwise (unless out the top of the tank and onto the floor) Quote Link to comment Share on other sites More sharing options...
reef Posted September 8, 2006 Report Share Posted September 8, 2006 so how are you going to stop it syphoning the water out of the overflow.? the main pump might not keep up. Quote Link to comment Share on other sites More sharing options...
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