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  1. #1

    Water parameters

    Hi guys,
    just need your advise, put the fish in my new pond on Saturday and I’ve just done a water test, the part I don’t understand is KH and GH.
    my readings are as follows.

    phosphate 0.5
    ph 7.5
    Ammonia 0
    nitrite 0
    nitrate 5
    KH 8 drops
    GH 15 drops
    thanks for the help guys..RX



  2. #2
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    KH and GH are the hardness of your water.

    Have a look on Manky Sanke's website as there is a lot of useful information on it regarding all things fish related

    https://www.mankysanke.co.uk/

    Hope that helps.

    Those readings look like you've only recently set your pond up possibly and your filters haven't started to mature yet?

    It's worth testing your tap water as well so you have a comparison as that's what you are going to be using for top ups and refills etc.

    Might be worth getting some DPD4 tablets to check for chlorine.
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  4. #3
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    Forgot to mention that with a KH of that level you should be less likely to get pH crashes unless you do something very drastic with treatment or massive water changes if your mains water is a much lower reading for KH and pH I think you'll find?
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    Get up, eat jelly, sandwich bars and barbed wire,
    Squash every week into a day.

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  6. #4
    Senior Member Rank = Supreme Champion Ajm's Avatar
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    Quote Originally Posted by Frimley Koi keeper View Post
    KH and GH are the hardness of your water.

    Have a look on Manky Sanke's website as there is a lot of useful information on it regarding all things fish related

    https://www.mankysanke.co.uk/

    Hope that helps.

    Those readings look like you've only recently set your pond up possibly and your filters haven't started to mature yet?

    It's worth testing your tap water as well so you have a comparison as that's what you are going to be using for top ups and refills etc.

    Might be worth getting some DPD4 tablets to check for chlorine.
    Surprised at kh 8 the ph isn't a touch higher.. (thats not to worry tho it's all good that)

    Sent from my F5121 using Tapatalk
    Johnathan

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  8. #5
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    I think I'll leave it for Syd to explain it a bit better
    ________________________________________________
    All we ever wanted was everything,
    All we ever got was cold,
    Get up, eat jelly, sandwich bars and barbed wire,
    Squash every week into a day.

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  10. #6
    No problem.
    KH is the carbonate hardness and is what buffers the pH against variations or a pH crash. Higher values of KH provide greater buffering but this also means a higher pH. Ponds can successfully be run at a low KH by those who want to emulate the low TDS and pH values found in Japanese mud ponds but this requires a commitment to regularly measure the pH and KH and make small adjustments to the KH either manually or by an electronic measurement and control system. Those who want a less demanding regime are advised to keep the KH between 5°KH and 7°KH and accept the higher pH it will cause. Your KH is higher than necessary but it won't harm the koi so you can let it fall naturally to the 5°KH - 7°KH range if you wish.

    GH has no effect on koi health but a low GH will allow fish with predominant beni (red) colouration such as kohaku to develop to the full extent that their genetics will allow. A high GH is better for sumi development. See this article on my website for a full explanation of the effects of hard or soft water on koi colour development:
    http://www.mankysanke.co.uk/html/chromatophores.htm

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  12. #7
    Thanks guys...Rx

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  14. #8
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    Not sure what you'd make of my GH and KH Syd lol GH is currently around 20 and KH is currently around 12 to 14 with a pH of 8.3 but the tank is currently maturing. My main pond is fairly similar but the pH is a bit lower.
    ________________________________________________
    All we ever wanted was everything,
    All we ever got was cold,
    Get up, eat jelly, sandwich bars and barbed wire,
    Squash every week into a day.

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  16. #9
    Quote Originally Posted by Frimley Koi keeper View Post
    Not sure what you'd make of my GH and KH Syd lol GH is currently around 20 and KH is currently around 12 to 14 with a pH of 8.3 but the tank is currently maturing. My main pond is fairly similar but the pH is a bit lower.

    Those are indeed high, but not uncommon in a very hard water area what are the KH and GH readings of your supply and have you added clay?

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  18. #10
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    Quote Originally Posted by Manky Sanke View Post
    Those are indeed high, but not uncommon in a very hard water area what are the KH and GH readings of your supply and have you added clay?
    Yes it's a very hard water area down here in Surrey

    I'll see if I can find a recent set of tap water test as from memory it's always been in that ball park Syd.

    Not added clay to the tank but did have a spell last year? of using clay in the main pond but more to try to remove fines as it has a flocating? Is that spelt right? effect so I was told?
    ________________________________________________
    All we ever wanted was everything,
    All we ever got was cold,
    Get up, eat jelly, sandwich bars and barbed wire,
    Squash every week into a day.

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  20. #11
    Quote Originally Posted by Frimley Koi keeper View Post
    Yes it's a very hard water area down here in Surrey

    I'll see if I can find a recent set of tap water test as from memory it's always been in that ball park Syd.

    Not added clay to the tank but did have a spell last year? of using clay in the main pond but more to try to remove fines as it has a flocating? Is that spelt right? effect so I was told?
    That explains your high readings. Your water supply source will be from the North Downs which is mainly chalk. The good thing is that you will never have to use clay for it's mineral benefits because there will be more than sufficient minerals dissolved in the supply and there is so much carbonate compounds in it that your regular water changes will bring in plenty of KH too.

    But, yes, clay can be used as a koi friendly flocculant (correct spelling) as opposed to some flocculants based on aluminium sulphate which are sometimes recommended on forums by people who obviously don't realise that aluminium sulphate can be toxic if ingested or under certain water parameter conditions.

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  22. #12
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    The stuff I have is Kusuri? Klay.

    The water's that hard round here it knackers the pipework. Well more the valves etc
    ________________________________________________
    All we ever wanted was everything,
    All we ever got was cold,
    Get up, eat jelly, sandwich bars and barbed wire,
    Squash every week into a day.

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