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  1. #21
    quote
    "
    If you carry on feeding and didn’t change water I think that nitrite will peak and then start to drop within 48 hours "

    Im kind of gobsmacked by that statement, crikey if the nitrite spike could be overcome that fast we'd all be happy wouldn't we but fact is it can take many months on a new system.

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  3. #22
    If I had the bottle I'd try taking all of the K1 out to see what happens.... I think most of the nitrification is taking place on the pond walls rather than in the Nexus.

    I only say that because after taking 25 litres of K1 out on advice of EA, it didn't change any parameter whatsoever.

    Sent from my Pixel 2 using Tapatalk

  4. #23
    personally I cant see how it could be beneficial removing some of the media, if its all in the filter then its all growing a bio film, if you take half of it out, what ever was on that media then dies, so you actually have less bio capacity than previously, it might not have got up to speed yet with nitrite but im assuming it was helping with ammonia?. Now its dead and will have to start the maturing process completely from scratch again when ever you put it back. What would have happened if your ammonia spiked because you took the media out, it could easily have done that, and then you would be fighting ammonia as well.

    How is less media with a supposedly thicker bio film, any better than more media with a supposedly thinner bio film ?, the media and bio film will always adapt to the load put on it, so assuming you actually have enough bio media, and your bio hasn't reached its maximum capacity, sooner or later it will catch up and do its job.

    I have to assume that evolution aqua, or at least some of the people at evolution aqua know a damn site more about it than me, but I have to be honest, with my limited understanding it doesn't make much sense.

  5. #24
    Doesn't make sense to me either, my thinking is exactly the same as yours, as is everyone else's on this thread I'd imagine.

    I'd like to put those points across to EA, but they already suspect I'm a troll and it's only a matter of time before they refuse to talk to me anymore!

    Sent from my Pixel 2 using Tapatalk
    Last edited by RS2OOO; 14-07-2018 at 02:46 PM.

  6. #25
    Nitrites reading 1 mg/l today!

    Feel that I have no choice but to do a partial water change, just refilling now, I guess around 1400 litres. (7000 litre pond, so about 20%).

  7. #26
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    What you could do is take the K1 you initially removed, PP it, rinse it, and start fishless cycling it in a bucket with an airstone.
    When it's mature swap it with another batch from your Nexus and do the same.

    I do think that much more of the biofilm lives on walls and inside pipes than we think.

    When I built the new pond I literally put ALL the mature K1 from my old filters into the new one. I had exactly the same number of fish, just a much larger water volume and bare walls. The pond did go through an ammonia and nitrite spike just as you would expect a new pond to. I think this proves how much of my old biofilm got left behind in the old pond lining.

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  9. #27
    Great idea Feline, thank you.... Just ordered some PP.

    Never used it before, is there anything I need to know?

    Would 1 gram per 10 litres suffice and is there anything I need to do to to the K1 after I've soaked it?

    Maybe the K1 I removed was doing something after all as nitrites were 1ppm today and they've not been that high before (except during the initial spike back in early May).

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  10. #28
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    Quote Originally Posted by RS2OOO View Post
    Great idea Feline, thank you.... Just ordered some PP.

    Never used it before, is there anything I need to know?

    Would 1 gram per 10 litres suffice and is there anything I need to do to to the K1 after I've soaked it?

    Maybe the K1 I removed was doing something after all as nitrites were 1ppm today and they've not been that high before (except during the initial spike back in early May).

    Sent from my Pixel 2 using Tapatalk
    1g per 10 litres would be rather a lot- I make that 100 ppm. You don't need to go quite than bonkers
    PP is strong stuff so you don't need a lot. I would use approx 1g per 100 litres for this purpose. It will go a nice deep purple.

    Make sure you put on gloves, a mask and some goggles to handle the stuff. It will oxidise your corneas, skin and lungs if it contacts them.
    Just dissolve the stuff in some really hot water and mix it into the submerged media.
    Agitate it well and let it soak for a few hours.

    I personally don't believe in pouring active PP down the drains (even though it would get quickly spent on organic matter in the drainage system). So I would neutralise it with a handful for ST crystals first. Then rinse off in clean water and your K1 should be a nice brown colour all over. Do a final rinse in dechlorinated water and then you're ready to start cycling it with ammonia.

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