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Thread: Pond ph 9.1

  1. #1
    Member Rank = Tosai rickya's Avatar
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    Pond ph 9.1

    Should I be worried with a ph of 9.1? My pond is normally around 8.8 but checked today and it’s 9.1

    pond is about 10 year old as a constant trickle via a water filter, tap water is around 8


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  2. #2
    Hi Rickya,

    At that level you probably need to start keeping a very close eye on the fish and the pH to make sure it doesn't go much higher.

    Taken from mankysanke's website - Questions Answered

    In a typical koi pond, the tendency will always be for the pH to fall over time due to biological action, especially in the biofilter. So slowly rising pH values are not common, but if the pH was allowed to rise above 9.0, koi will suffer from alkalosis and will exhibit the same symptoms as acidosis. Action to reduce the pH must be taken without delay. Although it is fairly commonly known that sodium bicarbonate will raise a low pond pH toward 8.4, chemically it is what is known as a buffer. This means that it will also reduce pH towards 8.4 if it is higher than that value. This may seem hard to understand but I have tried to make the explanation as non technical as possible in my Two Honeydew melons explanation
    Hope that helps.
    Adam

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  4. #3
    Member Rank = Tosai rickya's Avatar
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    Thanks Adam might have to follow that advice and get the ph down

  5. #4
    No worries. Let us know how you get on.

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  7. #5
    Extreme Koi Member Rank = Supreme Champion Frimley Koi keeper's Avatar
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    The other thing to think about is the higher the PH the more toxic the Ammonia is at any given temperature.

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  9. #6
    Hi,

    I have a thread going on here with similar issues to yourself,when did you last calibrate the pH meter/have you compared this to a pH colour drop test
    THE FOOD`S LOUSY!
    THE WATER IS TO COLD!
    THE POND NEEDS CLEANING!
    YOU SHOULD FEED US MORE OFTEN!

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  11. #7
    You can easily check the accuracy of a pH meter at the higher range of pond pH values by making an 8.4 pH test solution. Simply add sodium bicarbonate to some freshly boiled tap water until no more will dissolve. When it has cooled, its pH will be 8.4 and you can use this to verify that the meter reads correctly at that value.

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  13. #8
    Member Rank = Tosai rickya's Avatar
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    Iv got a ph buffer solution for the ph meter so I know it’s calibrated. I added 200g of bicarbonate of soda that as brought the ph down to 8.9. I’ve also brought a pond lab testing kit so I can test gh & kh.

    Iv had a big outbreak of blanket weed over the last week so I think this could be rising the ph as well. Also I always change my uv bulb in April and never had a problem with green water but the water is slightly green, probably down to all the sun we’ve had over the last 4-6 weeks, I can live with that tho

  14. #9
    Sounds like the bicarb has helped get the pH under control then mate; good news.

 

 

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