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How to operate a sterile hydroponic system

Discussion in 'Hydroponics / Aeroponics' started by jijiandfarmgang, Oct 31, 2014.


    Ogf New Member

    Can you please explain your mixing ratio to get 1mil per gallon in rez to equal 1ppm? I would like to make 2 gallon batches and dose at 1mil per gallon in my Rez to each 1ppm. Thanks in advance
    Budley Doright

    Budley Doright Well-Known Member

    .001 ml per litre will be 1 ppm, sorry I'm Canadian lol, convert litres to gallons will give you 3.79 so .0039 ml per gallon I think lol. Just vaped some concentrate and I'm confused lol.
    rkymtnman likes this.

    rkymtnman Well-Known Member

    just so you are aware, just like liquid laundry bleach, your solution will become weaker every time you open the lid and expose it to air.

    i prefer weighing out the pool shock and dose every res change.
    Budley Doright likes this.

    Rahz Well-Known Member Rollitup Advertiser

    Hypochlorite is converted to chloramine in the presence of nitrogen. Are you guys taking this into account?

    rkymtnman Well-Known Member

    only if you're running aquaponics, your fish wont' like it.

    chloramine is probably an even better disinfectant than chlorine since it doesn't break down when exposed to oxygen
    redi jedi

    redi jedi Well-Known Member

    Why? Chloramine works too. I dose my tap water with shock before I add nutes, not an issue IMO.

    Rahz Well-Known Member Rollitup Advertiser

    Hypochlorous acid disassociates into hypochlorite. This indicates there's no hypochlorous acid in pool shock or bleach. Presumably since hypochlorous acid doesn't readily react with nitrogen it will stay in solution longer, but how long I'm not sure and as soon as it disassociates into hypochlorite in a nutrient solution it will convert into chloramine. Once an effective level of hypochlorous acid has dissasociated the protection is about zero. UC Roots, which is HClO based doesn't specify how long it provides protection, so it's possible it remains mostly intact with proper PH for a week or more, but that's just a guess based on a product label.

    The dosage recommendation for Pythoff (chloramine based) at the labels listed gauranteed analysis comes out to 29 ppm. Conventional wisdom suggests 4 ppm hypochlorite keeps water sterile, which suggests chloramine is 7x weaker than hypochlorite.

    The main point is that if you add bleach to a nitrogen solution, there's not going to be any hypochlorite in the solution. It get's converted into chloramine within minutes. Chloramine sterilizes just fine, but if you're dosing based on 4 ppm hypochlorite you end up with around 4 ppm chloramine which probably isn't going to offer any protection. That is also a guess based on product lables, but I think it's worth looking into.

    rkymtnman Well-Known Member

    doesn't the ratio of chlorine to ammonia have to be close to 5:1 to produce chloramine?

    if you are adding 1ppm chlorine to a res with maybe 9 ppm of ammonia (7grams maxibloom), your ratio is not correct to even produce chloramine?

    Rahz Well-Known Member Rollitup Advertiser

    That's just the ratio needed to produce chloramine without chemicals being left over, possibly uses ammonia because it's the cheaper form of nitrogen. I'm not a chemist so I can't give you hard answers, but like I said it's something worth looking into.

    This all started for me when I noticed 20 ppm hypochlorite in a nutrient solution wouldn't phase the rot, however 5 ppm in plain water would turn dark brown rot light tan within several hours. It seemed like the nutrient solution was affecting the ability of the bleach to sterilize so I started doing some research.

    I would be happy for an authority on the subject to drop in and clear things up.
    rkymtnman likes this.

    rkymtnman Well-Known Member

    i'm with ya. my last chem class was in 1987.

    all i know in laymens' terms is that pool shock works well.

    i'm using a hydroguard replacement at the moment for the last few grows. works just as well too.
    Rahz and redi jedi like this.

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