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Thread: NPS and Nitrite

  1. #1
    Member Rank = Nisai Gburgess22's Avatar
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    NPS and Nitrite

    I wonder if somebody that has been through NPS and maturing a filter could give me some reassurance that I am doing the right things and that this nitrite will eventually come down.
    Pond running for 8 weeks
    5400 gallons
    6 x 30cm fish
    300 litres of K1 bubbling.
    Almost zero food all of June and July. A small handful each weekend.
    Nitrite was zero while the ammonia was high, then ammonia dropped down to near zero and the nitrite fun began. Nitrite hovered around 0.25 for around 2 weeks after the ammonia dropped off, then the nitrite readings started marching upwards.
    Nitrite readings
    Continual trickle in of around 1litre per minute (~ 5% per day, 40% per week)
    1st May 1st June Ammonia coming down and nitrite hovered around 0.25
    1st June 0.25
    12th June 0.4
    30th June 0.5
    6th July 0.86
    Upped the trickle in to 2 litre per minute (~ 10% per day, 80% per week)
    Very surprised the nitrite did not come down more.
    12th July 0.8

    Obviously, this is a lot of water and I question myself as to if it is too much and detrimental for the nitrite bacteria maturing. Or do I need to keep on top of this to stop the nitrite raising even further?

    I understand that as its not bulk water changes the new water will be mixing and running out of the pond hence bringing down the actual water change affect. Would I be better off with bulk changes?

    Worried for the fish given these readings and looking for some opinions.



  2. #2
    Senior Member Rank = Rokusai Big nige's Avatar
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    On a personal level I think trickle in/out is great for mature ponds but as you are aware already it's not the same as bulk water changes.
    I would immediately start water changes to at least dilute the nitrite, you may need to do them every other day ( possibly daily to start with) to keep nitrite at lower levels. Boost your bacteria with pond bombs or similar good bacteria starters and be patient, it will come good.
    Everyone goes through NPS I myself in the early days was doing 10/15% water changes daily to keep water close to where it needed to be.
    It will get there, just keep testing your water, do water changes (not trickle in/out) and all of a sudden bingo results NPS and Nitrite

    Sent from my moto e6 play using Tapatalk

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  4. #3
    Member Rank = Nisai Gburgess22's Avatar
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    thanks Big Nige for the reassurance.
    It just keeps coming, some big water changes over the past week and it continues to rise and does not seem to dilute to safe levels.

    Fri 16th July - 25% water change
    Sat 17th July - 0.95
    Sun 18th July - 25% water change
    Mon 19th July - 1.08
    Tue 20th July - 25% water change
    Wed 21st July - 1.00

    The fish seem to be dealing with it, but i hate to think i am poising them.

  5. #4
    Senior Member Rank = Rokusai Big nige's Avatar
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    It does seem like a uphill slog sometimes, pond salt can help to protect the fish a little also if your pH is high ( between 7.5 and 8.5) strange as it may sound the nitrite is slightly less toxic than at lower pH, ammonia on the other hand is more toxic at higher pH so as long as ammonia is near zero your getting thereNPS and Nitrite and the fact the fish aren't going nuts is a good sign

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  7. #5
    Member Rank = Nisai Gburgess22's Avatar
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    that's great to know, thanks Big Nige. My PH does sit around 8.4 / 8.5

    Some big water changes this week.
    Wed 21st July - 20% bulk water change - Nitrite 1.0
    Thur 22nd July - 20% bulk water change - Nitrite - 1.0
    Fri 23rd July - 20% bulk water change - Nitrite - 1.03
    Sat 24th July - 25% bulk water change - Nitrite - 1.0
    Sun 25th July - Nitrite - ?

    My Saturday morning draining Hanningfield Reservoir
    IMG_1465.jpg

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  9. #6
    Senior Member Rank = Rokusai Big nige's Avatar
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    That's a lovely pondNPS and Nitrite

    Sent from my moto e6 play using Tapatalk

 

 

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