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  1. #1
    Senior Member Rank = Jussai Alburglar's Avatar
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    Carbon water filters WITHOUT THE KOI TAX!

    For those whom don't know these are horrifically over priced around 380 for a large one that holds around 50 litres of carbon and usually consist of:

    50L carbon 60-120 (usually nearer the top end, but I just ebayd 50L/ 25kg activated granulated carbon for 58 delivered)

    Stage 1 uses a 10″ 5 micron per filter to dirt, iron as well as other particulates.
    (Can be bought for around 10 all over the Internet, most of you pond people will have one knocking around already, or even better- a 3 Stage pod)

    Stage 2 is the larger granular activated carbon filter, which removes chorine and dissolved contaminants.
    - this is usually a fiberglassed reinforced polypropylene bottle. Which was the hard bit to find cheap.
    I found it is the same used in various water treatment applications. The most prolific being available as 2nd hand Calcium treatment units (CTU) for industrial ovens or Di resin units for car and window cleaners. - so keep your eyes peeled on eBay
    Most come as standard with a basic 2.5" threaded hole and head with a couple 3/4" in and out plus a tube and slotted end.

    I have just found a source of brand new ones and have purchased one for very reasonable money. Why so cheap: they have a 4" threaded hole instead of the standard 2.5".
    Pros - much easier to empty and fill
    Cons- no one does a 4" head, that I could find! But what I did find is

    Threaded reducer 4" to 2.5"
    20 delivered
    https://www.industrialwaterequipment...reducer-2-5-4/
    I have this now and it's very good quality.

    Distribution system 22"
    23 delivered
    https://groaqua.store/products/prism...45913695420730
    We'll see how good this is once it arrives.

    And the best thing is, the company accidentally sent me 4 of the large bottles. Therefore, if they don't ask for them back I'll be selling them on for anyone interested. And they do want them back, and there is enough interest I'm happy to buy them off the company and sell them on.

    Anyone keen at 60 delivered?
    Order the other bits yourself and save yourself 150 on the Koi shop equivalent! I will make a little bit on these, but you'll save a load.

    Wheelie bin for scale purposes. These are big! But not the normal size of around 9.5" x 46". These ones are 13" x 24"



    Last edited by Alburglar; 09-02-2024 at 03:23 PM.
    2660 Gallons. 4" Bottom Drain and Skimmer. Draco Solum 16 Drum. Anoxic Filtration. Air lift returns.

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  3. #2
    Senior Member Rank = Supreme Champion davethefish1's Avatar
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    well done on the freebies mate!
    what size are the big bottles? 48" x 10"?

    58 for 25kg of activated carbon is a really good price.
    would be good to have a link for future

    i'm still stocked on activated, catalytic, and bone char carbon from last year.
    as my dechlorinator set up lasts well over a year now.

    i use a cheap big funnel to pour carbon in around the neck,
    though finchy is doing those wide neck funnels now for 14

    https://www.finchfiltration.co.uk/pr...filling-funnel

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  5. #3
    Extreme Koi Member Rank = Supreme Champion john1's Avatar
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    Good to hear you got a bargain Al ,beats the koi tax.
    John

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  7. #4
    Senior Member Rank = Jussai Alburglar's Avatar
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    Quote Originally Posted by davethefish1 View Post
    well done on the freebies mate!
    what size are the big bottles? 48" x 10"?

    58 for 25kg of activated carbon is a really good price.
    would be good to have a link for future

    i'm still stocked on activated, catalytic, and bone char carbon from last year.
    as my dechlorinator set up lasts well over a year now.

    i use a cheap big funnel to pour carbon in around the neck,
    though finchy is doing those wide neck funnels now for 14

    https://www.finchfiltration.co.uk/pr...filling-funnel
    The normal ones are around 9.5" x 46" / 10" x 48" (thin and tall).
    These ones are short and stubby, at 13" x 24" but should hold the same amount.

    I haven't posted up the eBay link for the carbon, because I bought the last one. It's on my watch list though, so if it resurfaces I'll post it up.
    2660 Gallons. 4" Bottom Drain and Skimmer. Draco Solum 16 Drum. Anoxic Filtration. Air lift returns.

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  9. #5
    Senior Member Rank = Supreme Champion davethefish1's Avatar
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    Quote Originally Posted by Alburglar View Post
    The normal ones are around 9.5" x 46" / 10" x 48" (thin and tall).
    These ones are short and stubby, at 13" x 24" but should hold the same amount.

    I haven't posted up the eBay link for the carbon, because I bought the last one. It's on my watch list though, so if it resurfaces I'll post it up.
    they are a great idea for anyone with limited height room, much better than the 24" x 8"

    as you can only fill the big blues to within about 4" of the top.
    so the 24" x 8" diameter only holds about 15 litres of carbon, vs the 36" x 8" @ 25 litres.

    something i've noticed though is how much difference you get in volume of the different types of carbon.
    to see how far it would go i measured how much i was filling my 36" x 8" big blues,
    and they hold 25 litres of carbon with a 4" gap for the strainer and head.

    this is what i got from the different 25 kg bags of carbon i bought.

    25kg bone char 48 litres just shy of 2 x fills
    25kg catalytic carbon 68 litres easily 5 fills from two 25kg bags
    25 kg activated carbon 61 litres just short of 5 fills from 2 x 25kg bags

  10. #6
    Senior Member Rank = Jussai Alburglar's Avatar
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    I'll see how much these take once the carbon arrives.
    Online calculator reckoned 50 litres or there abouts, but what that equates to in real life I have no experience of.
    I'd prefer it if only took half the bag to be honest.
    2660 Gallons. 4" Bottom Drain and Skimmer. Draco Solum 16 Drum. Anoxic Filtration. Air lift returns.

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    Senior Member Rank = Jussai Alburglar's Avatar
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    Quote Originally Posted by davethefish1 View Post
    i use a cheap big funnel to pour carbon in around the neck,
    though finchy is doing those wide neck funnels now for 14

    https://www.finchfiltration.co.uk/pr...filling-funnel
    I saw those for a tenner on one of the DI resin window cleaning websites. It even had a bit in the centre to block the tube from being filled.
    2660 Gallons. 4" Bottom Drain and Skimmer. Draco Solum 16 Drum. Anoxic Filtration. Air lift returns.

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  14. #8
    Senior Member Rank = Jussai Alburglar's Avatar
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    Quote Originally Posted by Alburglar View Post
    I saw those for a tenner on one of the DI resin window cleaning websites. It even had a bit in the centre to block the tube from being filled.
    12 for this one
    https://www.osmotics.co.uk/parts-acc...hoCuGMQAvD_BwE



    Or 30 for one that sits inside the centre tube looks the proper job

    https://www.osmotics.co.uk/parts-acc...hoC8PkQAvD_BwE

    Last edited by Alburglar; 09-02-2024 at 07:33 PM.
    2660 Gallons. 4" Bottom Drain and Skimmer. Draco Solum 16 Drum. Anoxic Filtration. Air lift returns.

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  16. #9
    Senior Member Rank = Supreme Champion davethefish1's Avatar
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    Quote Originally Posted by Alburglar View Post
    I saw those for a tenner on one of the DI resin window cleaning websites. It even had a bit in the centre to block the tube from being filled.
    good find that mate

  17. #10
    Senior Member Rank = Supreme Champion davethefish1's Avatar
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    Quote Originally Posted by Alburglar View Post
    The normal ones are around 9.5" x 46" / 10" x 48" (thin and tall).
    These ones are short and stubby, at 13" x 24" but should hold the same amount.

    I haven't posted up the eBay link for the carbon, because I bought the last one. It's on my watch list though, so if it resurfaces I'll post it up.
    I just used a 2 litre jug to measure out each scoop to put in the vessle. remembering to leave enough room for the strainer in the head.
    on mine it's about 4"

    I don't know if i could lift a vessle with 25kgs of carbon in it once it's had water in it,
    i struggle enough with the 36" x 8" ones with 25 litres
    even after connecting the stem connection to a hose pipe to syphon out all the water and make it lighter...

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  19. #11
    Senior Member Rank = Jussai Alburglar's Avatar
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    Look good!



    2660 Gallons. 4" Bottom Drain and Skimmer. Draco Solum 16 Drum. Anoxic Filtration. Air lift returns.

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  21. #12
    Senior Member Rank = Supreme Champion davethefish1's Avatar
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    Quote Originally Posted by Alburglar View Post
    Look good!
    they look the business mate!
    and a lot wider than you'd think!

    you did make sure they haven't charged you for all 4 bottles...

  22. #13
    Senior Member Rank = Jussai Alburglar's Avatar
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    ...not yet, but I'll give it a month before I count my chickens...
    Once it's safe, I may buy 3 converters and 3 heads and sell them as a package on eBay, if no one on here wants one.
    2660 Gallons. 4" Bottom Drain and Skimmer. Draco Solum 16 Drum. Anoxic Filtration. Air lift returns.

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  24. #14
    Senior Member Rank = Supreme Champion davethefish1's Avatar
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    Quote Originally Posted by Alburglar View Post
    ...not yet, but I'll give it a month before I count my chickens...
    Once it's safe, I may buy 3 converters and 3 heads and sell them as a package on eBay, if no one on here wants one.
    i've already got 3 x 36" big blues,
    but you won't have any trouble shifting those, as some don't have to height to fit 36" bottles plus the head piece in the filter house.
    i've seen lots of people on youtube with the 2ft bottles that only hold 15litres x 3 for 45 litres total.

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