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Thread: Alfagrog

  1. #1
    Senior Member Rank = Adult Champion Ant62's Avatar
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    Alfagrog

    Just wondering etc about possible nitrates..

    This past few weeks while ive be laid up ive been reading about K1 in the diy static barrel and it can cause an increase in nitrates and a way to combat this is to replace the k1 with alfagrog....

    What is everybodies thought upon this........




    I do have a bag of alfagrog sat unused.....



  2. #2
    The end result of all conventional (nitrogen cycle) filtration is nitrate on a ratio of almost one ammonia molecule becomes one nitrate molecule. So the bugs on K1, JapMat or BioBalls etc. are no different to those on the outside of any other media. They do the same job and have the same nitrate output whether they are on plastic media or one of the porous medias such as BHM, Alphagrog or pumice etc.

    The insides of porous medias provide a home for my favourite bugs (because they allow me to show off). These bugs are in the bacterial family - facultative anaerobic chemo-litho-autotrophs and they obtain the oxygen they need by stealing it from the nitrate made by their cousins on the outsides of the media.

    So K1 doesn't cause an increase in nitrate in any greater respect than the bugs on the outsides of any other media but porous media, like Alphagrog have bugs on their insides that reduce nitrate levels.

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  4. #3
    Senior Member Rank = Adult Champion Ant62's Avatar
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    Cheers Mr Sanke..

  5. #4
    ive had alfagrog in my multibay before, but i don't rate it as a submerged media, because my feeling is the water just flows around it, instead of through it, so most of that huge surface area, that's actually inside the grog,
    doesn't get used, i had air going up through it too, but still nowhere near as good as moving bed k1 imo.

    However for a shower i think its great, dirt cheap and very efficient imo.

    Could be wrong but i didn't like it submerged in my multibay, it will need drum filtration before it too, because it gathers muck very quickly, otherwise you lose all the surface area, and its awful to clean.

    David

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  7. #5
    Quote Originally Posted by Ant62 View Post
    Just wondering etc about possible nitrates..

    This past few weeks while ive be laid up ive been reading about K1 in the diy static barrel and it can cause an increase in nitrates and a way to combat this is to replace the k1 with alfagrog....

    What is everybodies thought upon this........

    I do have a bag of alfagrog sat unused.....
    Manky has provided complete answer on your question, so there is just little addition only - the only setup, in which K1 actually helps to REDUCE nitrates is in De-nitrifying trickle tower design - which Manky has covered very well on his web site here - Good water guide: pt 16

    Based on his great insight I have built de-nitrifying trickle tower combo - just instead of K1 I used Hel-X 17mm - as I was buying it new so I could choose what I think works better in this particular setup - as it has slightly higher active surface area with greater void ratio at the same time - e.g. less prone to clogging while offering a bit more active surface from the same volume of media.

    If interested my experience with it is covered here - Building Denitrifying Trickle Tower Combo

    Good luck!

    Milaz
    You get what you pay for - or better - what you make yourself.

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  9. #6
    i have alfagrog in my water butts on my grow on. and to get it out to clean is a horrible job. a few times now i have had cut and grazed fingers in handling the grog.
    eventually i am going to change this for another type of media. also cleaning and bio side of things i do not thing it is that good. i have jap matt above and wool for fines.
    there good. but the grog in my opinion is not doing the job. so i am going to put a trickle shower in. and put some of the grog in there.

  10. #7
    Senior Member Rank = Hassai dc197's Avatar
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    Who h job is your grog not doing Freddy?
    Does it need cleaning because the mechanical filtration prior to the grog is letting through too much dirt?

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    When I used grog in the past I hung it in onion sacks so I can get it out easier for cleaning. I found it colonised quickly as a bio media, but lacked the surface area to support a big bio load for it's volume, when compared to K1. In my old ponds anyway

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  14. #9
    Quote Originally Posted by dc197 View Post
    Who h job is your grog not doing Freddy?
    Does it need cleaning because the mechanical filtration prior to the grog is letting through too much dirt?
    this is on my grow on. not main pond. i have easy pod. first. then 2 x butts. i clean the butts out every six months. and the butts are narrow and deep. so it is hard to get at the bottom. there is a waste valve on them.
    to clean. the water in the tank is crystal clear. so the filters are working. but the nitrite keeps coming up. so on that side of things i have to find a balance. i only empty and take out to look to see if there is a build up of muck in the bottom and in between the grog. just for safety of mind really. so no it is not letting to much dirt through. i am slowly getting to trust it. but it still is not where i want it yet. and that is after a year now. so next is a trickle shower on the end.

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  16. #10
    Quote Originally Posted by Feline View Post
    When I used grog in the past I hung it in onion sacks so I can get it out easier for cleaning. I found it colonised quickly as a bio media, but lacked the surface area to support a big bio load for it's volume, when compared to K1. In my old ponds anyway
    good idea that the onion sacks. is that the plastic like netting stuff. or hessian sacks

 

 

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