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  1. #821
    Thanks. eventually the levels reach the same on both clean and dirty sides but takes a couple of minutes. the skimmer line runs straight into the drum as does the BD.

  2. #822
    Quote Originally Posted by -Craig- View Post
    Thanks. eventually the levels reach the same on both clean and dirty sides but takes a couple of minutes. the skimmer line runs straight into the drum as does the BD.
    Minutes? I was hoping you’d say seconds,
    With a clean screen, they should equalize almost instaneously. A few minutes suggests to me there is something blocking the screen.

  3. #823
    Also what’s after the drum? Is it just a pump going directly back to the pond or do you have another filter in between?

  4. #824
    Quote Originally Posted by Toffee View Post
    Okay but when the pump is off is the water on the dirty side level with the water on the clean side?

    skimmer is that feeding into the drum or not?
    Hi the skimmer is fed straight to the drum as is the BD the levels when the pump is switched of do get to the same level but it takes a couple of minutes to get there.

  5. #825
    Quote Originally Posted by Toffee View Post
    Also what’s after the drum? Is it just a pump going directly back to the pond or do you have another filter in between?
    sorry double posted. after the drum I have both outlets teed of to go to the bead filter and the UV the UV line goes to two outlets at one of the pond and the return form the bead goes to another two outlets at the other end but I have one of each turned of as there does not seem to be any flow. probably due to the fact that the pump is on the lowest setting.

  6. #826
    Okay

    Heres what I think - I think it’s possibly a problem with your screens - I’m just going by the “it takes a couple of minutes (to equalize water levels on dirty with clean sides)” comment.

    i think it’s best test each component of the drum in isolation to see what may be th root of the problem.

    so to test the screen - (you may want to isolate your bead filter first to prevent it from getting dirty; you may also want to reroute your pressure pump intake to a clean bucket of water to keep your nozzles clean) - open the bypass on the drum filter to allow water from the dirty side into the clean side; make sure the sensor is completely covered in water, then gradually restrict the water inflow until the water level drops below your sensor level and triggers a cleaning cycle. If the drum cleans itself then the problem isn’t with the sensor or the motor - it’s your screen.

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  8. #827
    Quote Originally Posted by Toffee View Post
    Okay

    Heres what I think - I think it’s possibly a problem with your screens - I’m just going by the “it takes a couple of minutes (to equalize water levels on dirty with clean sides)” comment.

    i think it’s best test each component of the drum in isolation to see what may be th root of the problem.

    so to test the screen - (you may want to isolate your bead filter first to prevent it from getting dirty; you may also want to reroute your pressure pump intake to a clean bucket of water to keep your nozzles clean) - open the bypass on the drum filter to allow water from the dirty side into the clean side; make sure the sensor is completely covered in water, then gradually restrict the water inflow until the water level drops below your sensor level and triggers a cleaning cycle. If the drum cleans itself then the problem isn’t with the sensor or the motor - it’s your screen.
    Thanks Toffee. I will give that a go when I get home on Friday. That sounds like a perfect way to test it. Why don't I think of these things?

  9. #828
    Moderator Rank = Supreme Champion Feline's Avatar
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    From what you're saying it has to be the screen really.

    I remember a while back there was an issue with a few drums (can't remember which make) that came with some kind of a waxy coating from the factory on the screens (I think from memory it was beginning/end of a production roll that caused the issue).

    People with affected drums had to pressure wash the screens to remove the coating, and after that the screens were fine. Just wondering if yours could possibly be affected in that way. If it was just biofilm buildup then really the citric acid should have cured it. But if you have a Karsher it would be a relatively easy theory to test?

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  11. #829
    Extreme Koi Member Rank = Supreme Champion Davej's Avatar
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    Agree that it must be the screen, worth checking the nozzles are clean and working effectively though.


    Dave

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  13. #830
    Quote Originally Posted by Feline View Post
    From what you're saying it has to be the screen really.

    I remember a while back there was an issue with a few drums (can't remember which make) that came with some kind of a waxy coating from the factory on the screens (I think from memory it was beginning/end of a production roll that caused the issue).

    People with affected drums had to pressure wash the screens to remove the coating, and after that the screens were fine. Just wondering if yours could possibly be affected in that way. If it was just biofilm buildup then really the citric acid should have cured it. But if you have a Karsher it would be a relatively easy theory to test?
    thanks Feline. When you see it in black and white it makes so much sense that it has to be the screen, although I did discount that due to soaking in acid the other week. I will take it out and give it a good jet wash at the weekend and maybe another soak to be 100% sure it is clean,
    this may even solve the skimmer issue as with the clean side not filling I am thinking that the flow,into the drum would be minimal due to drum and pond being at the same level.
    thanks again.

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  15. #831
    Quote Originally Posted by Davej View Post
    Agree that it must be the screen, worth checking the nozzles are clean and working effectively though.


    Dave
    thanks Dave, the nozzles are spitting out plenty of water when it does clean, I have the wash pump connected to a water butt that is constantly topped up with fresh tap water so that is clean and does not get any crud in it.

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  17. #832
    Senior Member Rank = Supreme Champion freddyboy's Avatar
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    Quote Originally Posted by Feline View Post
    From what you're saying it has to be the screen really.

    I remember a while back there was an issue with a few drums (can't remember which make) that came with some kind of a waxy coating from the factory on the screens (I think from memory it was beginning/end of a production roll that caused the issue).

    People with affected drums had to pressure wash the screens to remove the coating, and after that the screens were fine. Just wondering if yours could possibly be affected in that way. If it was just biofilm buildup then really the citric acid should have cured it. But if you have a Karsher it would be a relatively easy theory to test?
    your spot on feline that was mine. I pressure washed it down and ran ok

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  19. #833
    Thanks for everyone’s advice. I took the screen out yesterday jet washed it three times then soaked it in a kilo of citric acid for 4 hours jet washed again and now I am pulling about 25000 litres an hour through (based on pump speeds) I added a 20000 variflow to run the bead only and have that sat at 70% and the original 30000 is sat at 65% and is just running direct to the UV. Now have masses of flow on the top and bottom of the pond, the water is clearing up nicely and the skimmer is working a treat too.

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  21. #834
    Glad to hear that Craig

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  23. #835
    Senior Member Rank = Supreme Champion freddyboy's Avatar
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    Same here mate. Glad alls well

    Sent from my SM-G925F using Tapatalk

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  25. #836
    Extreme Koi Member Rank = Supreme Champion john1's Avatar
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    Glad your sorted and happy Craig,said it was the screen.
    John

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  27. #837
    Member Rank = Sansai Mwrightlx's Avatar
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    Quote Originally Posted by Rog.G View Post
    Well at last I have the special transformer I was waiting for and I have plumbed the mains water cleaning supply to the drum. It's all working perfectly and the pond is clearing all the time. Although it cost me an extra week waiting for the transformer I am so pleased with the end result. The theory is, the chlorine in the mains water keeps the bio film from building up on the drum mesh and "no pump to worry about"😀😀
    So far no issues with fluctuations in water height, the auto top up seems ok and the overflow I installed in the front of the drum is working spot on.

    Sadly my koi have been back in the pond for a week with only the bio filter working with the water bypassing the drum which resulted in the water becoming murky, my koi disliked it so much one of them jumped out early yesterday morning and is badly damaged.

    Hi Rog,
    I too have just switched to mains cleaning but I’m not very impressed. It’s only operating at about 1/4 of the power of the pump set up.

    Any chance you could do a diagram with some pictures of your set up, including supply pipe sizes and pressure/ flow rate if you have that data.
    when I measure my mains I get just under 6bar so I guess I have insuffience flow?

    fluid dynamics are not my thing, I hope you can shed some light on this for me.

    Cheers
    Matt

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  29. #838
    Senior Member Rank = Nanasai Handy Kenny's Avatar
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    Originally I fed my AEM drum from the output (clean) side of the drum (or rather the 4" pipe that left the drum). As my drum is gravity fed and gravity out what sometimes happened is that there was not enough depth of water in the clean side to stop the pressure pump. I now pick up the pressure pump water from a small sump (2 feet deep) which was part of my original filter in the ground.

    I have changed the float switch to a cheap Chinese model on the dirty side. i.e. if the dirty side rises the cleaning process starts, water flows through the screen and the water on the dirty side drops and shuts of the float. A couple of times though the drum has been going for longer than it should although there seemed plenty of pressure from the pump, this was caused by a build up of biofilm on the screen which I attacked with my 7 series Karcher (most powerful) this didn't actually clean it at the first go (which surprised me) so I had to do it a couple of times. So that needs watching. Another thing which I now do is that when I add bicarbonate of soda I fling it inside the dirty side of the drum and on top of the part of the screen above the water which will be cleaned off at the the next cleaning cycle. Bicarb is a good cleaning agent so I hope that it cleans the screen and means I may have to pressure wash less often. Your screens may not be out of the water as much as mine as I have gravity out into a sump which means there is much less water on the clean side of the drum.

    Kenny
    Last edited by Handy Kenny; 31-03-2019 at 07:37 PM.

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  31. #839
    Extreme Koi Member Rank = Nanasai Rog.G's Avatar
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    Quote Originally Posted by Mwrightlx View Post
    Hi Rog,
    I too have just switched to mains cleaning but I’m not very impressed. It’s only operating at about 1/4 of the power of the pump set up.

    Any chance you could do a diagram with some pictures of your set up, including supply pipe sizes and pressure/ flow rate if you have that data.
    when I measure my mains I get just under 6bar so I guess I have insuffience flow?

    fluid dynamics are not my thing, I hope you can shed some light on this for me.

    Cheers
    Matt
    HI Matt sorry for the delay in replying, you have probably sorted yourself out by now.
    If you look at my photos you will see that I have a 15mm speedfit mains supply up to a solenoid which has a male threaded outlet. It's been so long ago I can't remember the sizes of the pipework
    but I fitted a small piece of 20mm MDPE pipe about 50mm long with a screw connection so that I could then fit smooth bore flexible pipe between that and the spray bar. I connected the different sizes of flexible pipe together with a flexible pipe reducer fitting.
    Although my mains supply seems to be a good pressure [I have not checked how many bar] I must admit when I first saw it actually working I thought it wouldn't be sufficient to clean the drum but here I am nearly 2 years on and it's still cleaning and so far the mesh hasn't required the bio film cleaning.
    My pump is only 16000 litres/hr so I guess the stainless mesh copes ok.
    Attached Images Attached Images

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  33. #840
    Hi all, I am now living in Australia and I am looking at the AEM or Draco, I will need to get this shipped in and would like to be drama free, what would you recommend from the 2 as whatever I pick won't be coming back and support will be an issue with time difference
    Thanks in advance

 

 
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