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  1. #21
    Have a look at some of the Dutch ones, I canít recall what they call them at the moment but a bit of Googling will turn them up. Dead simple


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  2. #22
    Senior Member Rank = Kyusai Twhitenosugar's Avatar
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    Do they call them Creil Sieves? A sort of submerged sieve?

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  4. #23
    Member Rank = Tosai Point's Avatar
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    Hard to find any schematics of a criel sieve (never heard of one before) but it seems my design was a similar concept.. a reverse flow sieve.

  5. #24
    Quote Originally Posted by Twhitenosugar View Post
    Do they call them Creil Sieves? A sort of submerged sieve?

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    Thatís the thing


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  7. #25
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    Quote Originally Posted by Twhitenosugar View Post
    Do they call them Creil Sieves? A sort of submerged sieve?
    I'm glad you knew that mate cos being honest I had no idea what Bigcarpchaser was talking about lol

  8. #26
    You wouldnít be the first lol


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  10. #27
    Senior Member Rank = Kyusai Twhitenosugar's Avatar
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    Lol

    I've seen them mentioned on a few Dutch videos of koi ponds.

    My understanding is it's just a tank with a sieve mesh submerged diagonally and the water flows through the sieve.

    If that is right, (might not be) it seems to me not as good a design as a standard sieve, as the waste remains submerged, rather than on the sieve mesh out of the water.

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  12. #28
    Yep, it sits in the chamber until itís purged, which is why they tend to use them on air lift run ponds. They serve a purpose I guess in that theyíre simple but crap out ASAP is more desirable.

    https://youtu.be/X4L7xW4pzTU


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  13. #29
    Extreme Koi Member Rank = Supreme Champion john1's Avatar
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    If I remember it was 70 micron mesh but think larger would be better so it wont block so much.
    Think you have a thought there Point on that one
    Though as said it could become a pressure system and dont like the idea of matting tooooo much work to clean,could be doable and may work on a gravity system worth a bit of thinking about.
    John

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  15. #30
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    If the mesh got blocked there would be some back-pressure but the dirty overflow would solve that.. the only consequence I can see is that dirty water would flow through the system instead of cleaned water when the pump was running. I could overcome at least part of that by using a full width weir instead of a dirty overflow pipe and fitting vertical brushes (bristles) to the top edge of it to catch some of the crud. I suppose there could be an issue with the mesh distorting under pressure but it wouldn't take much to strengthen it.

    If the mesh got clogged and the pump was switched off for cleaning, by taking out the mats the top of the mesh could then be hosed/pressure washed to clear it enough to allow water through. Then let the water return to normal level, let the crud settle on the bottom and open the drain.

    The original idea was to add some extra filtration in for fines as I haven't got the space for additional filter boxes so wherever they were the maintenance would be the same.

    The added bonus of my concept (that I can see) is that the underside of the mesh would be partly self-cleaning via the water movement under it and gravity.

    I've got a whole garden to level and remodel first so plenty of time to make my mind up.. with the amount of work to do the pond side of things won't be done until next year. Chances are that I'll make a normal downflow sieve in the end lol.. my concept is just a result of my design engineers imagination getting out of control, as usual

  16. #31
    Senior Member Rank = Kyusai Twhitenosugar's Avatar
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    So after mentioning that my sieve was blocked, I gave it a good blast with a pressure washer yesterday.

    Attached is a picture of the mesh before it was cleaned. In this state, almost no water was getting through. It usually gets this blocked within a week or two of cleaning.



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  18. #32
    Senior Member Rank = Adult Champion samp09's Avatar
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    I think I will need to add a sieve over winter, I pulled out about a basketball sized ball of blanket weed out the bio section of my filter yesterday and the pump I use to dump to waste blocked up a few times with big balls of it. Are you pleased you added the sieve Tom?

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  20. #33
    Senior Member Rank = Kyusai Twhitenosugar's Avatar
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    Yeah definitely glad I added it. And being home made it cost little to make.

    The only thing I wish I did differently was, as mentioned, go for a larger micron mesh.

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  22. #34
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    Quote Originally Posted by Twhitenosugar View Post
    So after mentioning that my sieve was blocked, I gave it a good blast with a pressure washer yesterday.

    Attached is a picture of the mesh before it was cleaned. In this state, almost no water was getting through. It usually gets this blocked within a week or two of cleaning.


    Wow, that does look sticky and completely blocked. It does look like biofilm rather than particles as you said previously.

    Now that people have used them, what do you all think the best mesh size could be?

  23. #35
    Senior Member Rank = Kyusai Twhitenosugar's Avatar
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    Well that mesh is 125 micron mesh. So I'd say bigger than that.

    Most sieves have 200 or 300 microns. And I'm sure the manufacturers of the various sieves tried and tested many sizes before choosing those two. So I'd say go for 200 micron.

    As a comparison. I have 50, 100 and 200 micron filter socks that I stick on an air lift and drop into my pond if fines are really bad. The 50 microns clogs up probably within an hour, the 100 can go for maybe 2 - 3 hours before clogging and the 200 can go for maybe 6 - 8 hours.

    I get that you want your filter to remove as small as particles as possible. I was exactly the same, which is why I opted for 125 thinking it'll be superior to the 200 mesh. But you don't get a free lunch with filters and the smaller the particles a filter can remove, the higher frequency of cleaning. So unless you want to be cleaning filters everyday, try to look at both sides of the filter 'coin' when choosing your mesh (or for that matter any filter).

    As an example, look up any of the threads on here about the tempest (which claims, and seems to be able, to remove very small particles) and see how often people have to clean them.

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  25. #36
    Member Rank = Tosai Point's Avatar
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    Yes mate, I fully understand that finer filter material means more cleaning. Seems like AJM and John are having to clean more often than they thought with the 70mesh/210micron stuff which is why I asked what they would now prefer after using them for a while.

    I think it was a good idea you had earlier in the thread to have different micron size panels that can be switched out when needed to take some fines out.

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