lduncan Posted June 25, 2006 Report Share Posted June 25, 2006 The more holes the better. Quote Link to comment Share on other sites More sharing options...
suphew Posted June 26, 2006 Report Share Posted June 26, 2006 Yeah go mad with the holes. The strainers not there to restrict the flow, so the more the better. Also the holes will slowly close up as the algae, tube worms, corraline, etc grows, the more holes you have the less affect this will have. But I wouldn't go too large with them maybe 2-3mm(?), because you have a tap inline restricting your flow if anything large like a snail gets trapped on the tap it will cause the water level in the over flow to rise quickly (I'm sure you know this already). Also don't glue it in place, you need to be able to take it out to clean it, plus if your tap does get blocked you are going need to be able to somehow get to it if the blockage jams. Quote Link to comment Share on other sites More sharing options...
chimera Posted June 26, 2006 Report Share Posted June 26, 2006 Also the holes will slowly close up as the algae, tube worms, corraline, etc grows, the more holes you have the less affect this will have or in my case, valonia :evil: i would go a little larger than 2-3mm, more like 5mm Quote Link to comment Share on other sites More sharing options...
suphew Posted June 26, 2006 Report Share Posted June 26, 2006 or in my case, valonia i would go a little larger than 2-3mm, more like 5mm I would rather have the valonia stuck on the stainer than blocking up the tap restiction. Go the durso, don't have to worry about this stuff :lol: Quote Link to comment Share on other sites More sharing options...
lduncan Posted June 26, 2006 Report Share Posted June 26, 2006 You know what, I've had a ball valve running on a full siphon overflow for 4 or 5 years, never cleaned it, it's never clogged. I doubt there is much of anything growing on it. It's in a dark tube with a lot of flow. Just scraping the bottom of the barrel to find something wrong with a full siphon. Quote Link to comment Share on other sites More sharing options...
KP Posted June 26, 2006 Author Report Share Posted June 26, 2006 Current hole size is 4.5mm. Will double the number of holes. Also noticed that when I take the standpipe out it doesn't affect the water level, so basically all the restriction is due to the valve. Quote Link to comment Share on other sites More sharing options...
chimera Posted June 26, 2006 Report Share Posted June 26, 2006 Also noticed that when I take the standpipe out it doesn't affect the water level, so basically all the restriction is due to the valve you mean take out the entire length and U section of the standpipe the water level stays near the top? if so, increase the pipe down, too risky. water level should drop to near the bottom of the overflow chamber. with standpipe in, should be halfway (or thereabouts) across the U section. Quote Link to comment Share on other sites More sharing options...
lduncan Posted June 26, 2006 Report Share Posted June 26, 2006 But that's the way a full siphon works. The pipe should be irrelevant in the matter. Run the water level higher, to minimise noise. Run it lower if you want more auto adjusting margin. Quote Link to comment Share on other sites More sharing options...
KP Posted June 26, 2006 Author Report Share Posted June 26, 2006 what do you mean by u section? I'm just saying that the current standpipe is very effective at straining water, so much that it has basically no water flow resistance. 8) Quote Link to comment Share on other sites More sharing options...
suphew Posted June 26, 2006 Report Share Posted June 26, 2006 Just scraping the bottom of the barrel to find something wrong with a full siphon. I have never tried to 'find' anything wrong with full siphon systems, if people want to use them, that is fine by me. All I have done to point out to newbies that might not understand there is a trade off between noise and margin of safety in this choice. As well as the on going adjustments that MIGHT be neccessary. Quote Link to comment Share on other sites More sharing options...
lduncan Posted June 26, 2006 Report Share Posted June 26, 2006 Don't worry, I think KP understands what's going on and how it works better than most. The difference in safety margin is negligible, and as far as on-going adjustments I haven't had to other than for major changes to the return system. When set-up properly, they adjust themselves. Quote Link to comment Share on other sites More sharing options...
KP Posted June 26, 2006 Author Report Share Posted June 26, 2006 That took ages, well we now have 3x the holes Hopefully that will do it Quote Link to comment Share on other sites More sharing options...
TM Posted June 26, 2006 Report Share Posted June 26, 2006 I have never tried to 'find' anything wrong with full siphon systems, if people want to use them, that is fine by me. All I have done to point out to newbies that might not understand there is a trade off between noise and margin of safety in this choice. As well as the on going adjustments that MIGHT be neccessary If you set them up right from the start you will never have to adjust them, never. Quote Link to comment Share on other sites More sharing options...
lduncan Posted June 26, 2006 Report Share Posted June 26, 2006 exactly Quote Link to comment Share on other sites More sharing options...
suphew Posted June 26, 2006 Report Share Posted June 26, 2006 full siphons need adjusting occasionally. Its better to have the tap higher for easier access. You can add one to the pipes ypou have there in the overflow. Seems not all users of siphon systems agree with you. A little bit like claiming durso's aren't quiet but don't make or tune them correcty. Quote Link to comment Share on other sites More sharing options...
lduncan Posted June 26, 2006 Report Share Posted June 26, 2006 Physics is physics, you can't make a durso as quite as a full siphon because the durso design intentionally introduces air into the overflow. Layton Quote Link to comment Share on other sites More sharing options...
tel Posted June 26, 2006 Report Share Posted June 26, 2006 apparently reefs durso is silent. Quote Link to comment Share on other sites More sharing options...
reef Posted June 26, 2006 Report Share Posted June 26, 2006 kp I would make those holes bigger, tube worms/corraline algae build up on them so they will bloke them a little. Use a 10mm drill. Quote Link to comment Share on other sites More sharing options...
suphew Posted June 26, 2006 Report Share Posted June 26, 2006 Physics is physics, you can't make a durso as quite as a full siphon because the durso design intentionally introduces air into the overflow. Layton whats is your point? who said a durso was as quiet as a full siphon? Its a bit like saying something that is so quiet you can't hear it isn't as quiet as something that makes no noise. Its interesting that you are trying to use physic's to justify this non-arguement yet are happy to make statements like "The difference in safety margin is negligible" when any one who has an understanding of physic's will tell you that there is a huge difference in safety margins between something like my durso (50mm with 40mm bulkhead) that will handle 3-4 time the volume going through it and a full siphon that is adjusted so it only just handles the flow. If you dont believe me I'll double the flow through mine and you double the flow through your's and we'll see who gets wet first. I'm not going to post on this subject again in KP's thread, unless KP asks, it is pointless going over old ground again, and spoiling a good thread. Quote Link to comment Share on other sites More sharing options...
KP Posted June 26, 2006 Author Report Share Posted June 26, 2006 10mm is getting a bit close to what can fit through the valve. I'll rip out the valve and actually mearsure it sometime. Quote Link to comment Share on other sites More sharing options...
lduncan Posted June 26, 2006 Report Share Posted June 26, 2006 If you dont believe me I'll double the flow through mine and you double the flow through your's and we'll see who gets wet first. Quote Link to comment Share on other sites More sharing options...
suphew Posted June 26, 2006 Report Share Posted June 26, 2006 Thought you would like that one :lol: Quote Link to comment Share on other sites More sharing options...
reef Posted June 26, 2006 Report Share Posted June 26, 2006 here is a pic Quote Link to comment Share on other sites More sharing options...
KP Posted June 26, 2006 Author Report Share Posted June 26, 2006 wow its a jungle in there, how long has it been since you cleaned it :lol: :lol: I hope I can get that much stuff in my display tank Quote Link to comment Share on other sites More sharing options...
ghostface Posted June 26, 2006 Report Share Posted June 26, 2006 heres what i have. its pretty much idiot proof. it is a ball-valve controlled standpipe with a seperate tank fitting up near the top of the overflow. if the main syphon is restricted, any excess will go down the secondary line and into the sump. the water usually runs under the second line so nothing can get into it under normal conditions to block it. the second line can handle the entire volume of water coming from the return pump on its own. scuse the pic but you get the idea http://blowfish.co.nz/overflow.JPG Pic to big, changed to URL, please keep under 100KB Quote Link to comment Share on other sites More sharing options...
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