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Thread: High ph

  1. #1
    Member Rank = Sansai pfrosty's Avatar
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    High ph

    So new pond filled (7k litres) and been turning over the water thru nexus 220 and uv for around 2 weeks
    Started testing parameters and ph seems high around 9. I added some pure + filter start about 10 days ago. Thinking I need to start introducing a couple of small fish to kick start the cycling but just concerned about the ph.
    I could get some ph down treatment but not sure if theres an underlying issue with the water causing high ph.
    It's fibreglassed and was flow coated. Then filled about 48 hour afterwards.
    Any thoughts or suggestions pls?



  2. #2
    Senior Member Rank = Jussai Djstiles999's Avatar
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    What does your tap water read?

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  4. #3
    Member Rank = Sansai pfrosty's Avatar
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    7 or neutral
    Definitely green out of tap were pond is blue
    Used an inline declorinator when I filled to remove the chlorine
    Last edited by pfrosty; 09-07-2020 at 07:44 PM.

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    Senior Member Rank = Supreme Champion RS2OOO's Avatar
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    I would leave it for a few months and let the pond settle.

    If after that period you are still seeing a pH of 9 and want to bring it lower then adding bicarbonate of soda will bring it down to, I think, 8.4

    But for now I'd let the pond do it's own thing and it should find an equilibrium.

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  7. #5
    Member Rank = Sansai pfrosty's Avatar
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    Many thanks for your reply and advice mate.
    In an ideal world that's exactly what I would do.
    Unfortunately I'm moving home at the end of this month and my koi have to come with me to their new home that I've just built.
    I'm thinking if I do 20% water changes every 2 or 3 days for the next couple of weeks this should help to bring down the ph
    As I know the water coming from the tap is 7 or there abouts.

  8. #6
    Hi,
    I remember after having mine fibreglassed I filled it with water and left it for two weeks just running the bottom drain to a sieve and then pumping back to the pond. Then I dumped the water before refilling with fresh water and then added the fish.
    I did this after reading that as a recommendation - but I can’t remember where - it may have been on this forum...
    Cheers
    Ady


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    Quote Originally Posted by pfrosty View Post
    Many thanks for your reply and advice mate.
    In an ideal world that's exactly what I would do.
    Unfortunately I'm moving home at the end of this month and my koi have to come with me to their new home that I've just built.
    I'm thinking if I do 20% water changes every 2 or 3 days for the next couple of weeks this should help to bring down the ph
    As I know the water coming from the tap is 7 or there abouts.
    Also bear in mind that pH might be 7 out of the tap but it increases after you dechlorinate it so you want to measure what the pH is after it comes out of the dechlorinator, or after adding dechlorinator depending on which method you use.

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    Senior Member Rank = Rokusai Simon Fish's Avatar
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    My pond sat at that level for a year before settling down to around 7.6
    What's the level of the pond their in now?
    Buy a big bag of bicarbonate from Ebay, use it to bring the new pond down and slowly raise the old pond level if needed then there's not going to be a shock difference.

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  14. #9
    Member Rank = Sansai pfrosty's Avatar
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    Thanks that's good advice
    Ive ordered some Envii ph balance to bring the new pond down
    I'll go test the pond theyre in later today ��

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  16. #10
    Member Rank = Sansai pfrosty's Avatar
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    Looks like my ph on existing pond is somewhat acidic
    Attached Images Attached Images

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    Senior Member Rank = Rokusai Simon Fish's Avatar
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    That's more of a problem than it being high.
    Bicarbonate is dirt cheap by the sack compared to other treatments. It reaches a limit at a fraction under 8.4 so can send the reading up or down depending.

    You need to even things out, that swing could be lethal along with the stress of moving

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  19. #12
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    Alternatively to save adding chemicals to the pond, gradually trickle your high pH pond water into your low pH pond until they match.


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  20. #13
    Senior Member Rank = Rokusai Simon Fish's Avatar
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    Depends how far the house move is and if there's a hose long enough?

  21. #14
    Member Rank = Sansai pfrosty's Avatar
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    Good idea but would need a 5 mile hose pipe lol

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    Ah, missed that part lol.

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