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  1. #1
    Extreme Koi Member Rank = Supreme Champion Frimley Koi keeper's Avatar
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    hole diameter and amounts

    I'm going to fit a bit of 3" pressure into the outlet of a slide valve on the return from an Eazy Pod and then I'm going to fit a filter sock over it.

    What I am going to do is drill holes in the pipe to allow the water to flow out along the length of the filter sock so I get a more even spread of water going through the sock.

    I was going to try to use something like 10mm holes or maybe a bit bigger to make the equivalent area of the 3" pipe but spread over the length of the pipe.

    This was my way of thinking -

    If the area of a 3" diameter circle is 4415mm squared give or take a fraction of a mm squared then if I was to use 10mm holes which gives me 78.5mm squared per hole I would need 56 holes well 56.24 holes to be precise but I don't fancy trying to drill 0.24 of a hole so I'll just stick with 56 holes.

    If I go for 2 rows of holes that makes 28 holes per row.
    3 rows makes just over 18 holes per row.
    4 rows makes 14 holes per row.
    5 rows makes just over 11 holes per row.

    Obviously going for 12mm, 15mm or bigger will give me less holes but more water and muck will go down through the nearest holes and not spread too far along the pipe.

    It's basically going to be a spray bar but with an open end just in case some holes start to block which will then force the water further down the pipe before it starts to come out of the holes.

    Any suggestions on holes sizings or numbers of rows for the best results would be appreciated.

    Thanks in advance.

    BTW it's a good job we are in lock down still or I wouldn't have enough time for all these extra filter system modifications LOL



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  3. #2
    Extreme Koi Member Rank = Supreme Champion Frimley Koi keeper's Avatar
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    Just realised my deliberate mistake, the maximum length of pipe will be something like 400mm so that will dictate the number of holes per row I can have and then the number of rows I need too.

    I need to get the size of the smallest filter sock and work from there really.

    Fortunately the extra filter socks have just been delivered while I was writing this thread

    Looks like it's measuring time soon

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  5. #3
    Only you mate could make a massive thread about filter socks lol


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  7. #4
    Extreme Koi Member Rank = Supreme Champion Frimley Koi keeper's Avatar
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    I didn't know there were any restrictions on the subject of threads apart from the obvious

  8. #5
    There’s not so keep going mate, tho e inspired me to order some myself Lolol


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  10. #6
    Extreme Koi Member Rank = Supreme Champion john1's Avatar
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    Would have thought Frim the bigger the better and the more the merrier.
    John

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  12. #7
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    Quote Originally Posted by john1 View Post
    Would have thought Frim the bigger the better and the more the merrier.
    OK thanks John. I thought that if I go too big and too many then most of the water will be out of the pipe too soon.

    I think that's an open goal lol

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  14. #8
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    That's annoying the 4" filter socks that turned up yesterday won't even go over a bit of 3" pressure pipe and even a 3" waste pipe doesn't look promising either.

    Looks like a rethink is required. Going to stick with 3" though

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  16. #9
    Senior Member Rank = Kyusai Sim's Avatar
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    My bakki has 5 rows of 8mm holes about 3cm apart in a three inch manifold.
    i think if you want an even flow you will need an end cap.
    so maybe a couple of bigger holes in the top as an overflow.
    if you start with a bigger gap between the holes you will have the option of putting another hole between those if you want more flow.

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  18. #10
    Senior Member Rank = Kyusai Sim's Avatar
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    I though you were going to tell him to put a sock in it, with all these threads mr big

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  20. #11
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    Quote Originally Posted by Sim View Post
    I though you were going to tell him to put a sock in it, with all these threads mr big
    Don't give him any ideas for gord sake lol

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  22. #12
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    Quote Originally Posted by Sim View Post
    My bakki has 5 rows of 8mm holes about 3cm apart in a three inch manifold.
    i think if you want an even flow you will need an end cap.
    so maybe a couple of bigger holes in the top as an overflow.
    if you start with a bigger gap between the holes you will have the option of putting another hole between those if you want more flow.
    OK thanks, as you have a drum in front of your bakki shower you will have less muck getting to it so you can get away with smaller holes. Aa I've only got an Eazy Pod in front of mine I may need to go for slightly bigger holes? But if I mark out for 8mm holes and get enough spacing between them then I could always go up to 10mm or even 12mm either in various places or all the holes, couldn't I?

    Start small and go bigger if required.

    I don't need extra holes for an overflow as I have already built an overflow / bypass system into the pipework

  23. #13
    Senior Member Rank = Kyusai Sim's Avatar
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    Think I would still go to the smaller holes as the water will run out before getting to the end of the pipe, with will reduce the spread through your sock.
    there won’t be anything that big coming through the filter should have trapped it.
    if you come out of the filter put a T in and have the drilled out pipe vertical you could fill it with media as a trickle pipe, with the sock on the out side the same way

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  25. #14
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    Quote Originally Posted by Sim View Post
    Think I would still go to the smaller holes as the water will run out before getting to the end of the pipe, with will reduce the spread through your sock.
    there won’t be anything that big coming through the filter should have trapped it.
    if you come out of the filter put a T in and have the drilled out pipe vertical you could fill it with media as a trickle pipe, with the sock on the out side the same way
    I think that's a good idea but the pipe can only be run horizontally unfortunately

  26. #15
    Senior Member Rank = Kyusai Sim's Avatar
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    It could be under the water wouldn’t make much difference lol

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  28. #16
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    Quote Originally Posted by Sim View Post
    It could be under the water wouldn’t make much difference lol
    You may have given me an idea

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  30. #17
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    Quote Originally Posted by Sim View Post
    It could be under the water wouldn’t make much difference lol
    That's very similar to how the return was when I fitted the silencer on it which is now on the overflow / bypass system, so you may have given me another project.

    Will I ever get a chance to finish my QT? Lol

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  32. #18
    Senior Member Rank = Grand Champion RoyLittle0's Avatar
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    Quote Originally Posted by Frimley Koi keeper View Post
    I'm going to fit a bit of 3" pressure
    If the area of a 3" diameter circle is 4415mm squared give or take a fraction of a mm squared then if I was to use 10mm holes which gives me 78.5mm squared per hole I would need 56 holes well 56.24 holes to be precise but I
    3" Class C pressure pipe is 81.9 ID with an OD 88.9

    So assuming you will be working out the CSA of the ID, with a radius of 41 for ease, doesn't that give you a CSA of 5281.02 mm2

    Unless I am missing something that's 67.27 holes at 10mm diameter??
    4600 Gallon Concrete Block and Fiberglass
    2100 mm x 710 mm Infinity Window 32mm thick glass
    2 x Aerated Bottom Drains and Skimmer
    Filtreau HiFlow 30 Drum Filter
    Bio Chamber - 140 litres K1
    Bakki Shower - 30 KG Sakura Far Infrared Media
    2 x 18,000 lh pumps
    Heated from house boiler through a heat exchanger
    Idealseal MS290

    My Pond Build

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  34. #19
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    Quote Originally Posted by RoyLittle0 View Post
    3" Class C pressure pipe is 81.9 ID with an OD 88.9

    So assuming you will be working out the CSA of the ID, with a radius of 41 for ease, doesn't that give you a CSA of 5281.02 mm2

    Unless I am missing something that's 67.27 holes at 10mm diameter??
    Yes you are probably right Roy, I'll have to check my figures lol

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  36. #20
    Senior Member Rank = Grand Champion RoyLittle0's Avatar
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    Quote Originally Posted by Frimley Koi keeper View Post
    Yes you are probably right Roy, I'll have to check my figures lol
    Maybe you have a missing bead on you abacus? Lol


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    4600 Gallon Concrete Block and Fiberglass
    2100 mm x 710 mm Infinity Window 32mm thick glass
    2 x Aerated Bottom Drains and Skimmer
    Filtreau HiFlow 30 Drum Filter
    Bio Chamber - 140 litres K1
    Bakki Shower - 30 KG Sakura Far Infrared Media
    2 x 18,000 lh pumps
    Heated from house boiler through a heat exchanger
    Idealseal MS290

    My Pond Build

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