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The Curse of the IBC ... IMO

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  • #16
    Originally posted by Gary Donaldson View Post
    A purpose-built round aquaculture tank with a floor that slopes to a centre drain is the ideal vessel for growing fish. Everything thereafter requires compromise.

    My next preference would be for a round flat-bottomed tank....with with either a centre bottom drain or a solids-lifting outlet (SLO). Thereafter, in order of preference, I'd nominate a square tank (with a centre drain or SLO)...and then a square tank with a sloping bottom...only for the fact that I think solid fish tanks probably trump lined ones in terms of watertight integrity over time.

    The worst kind of fish tank is the squat rectangular one...and most IBC's fall into this category. There are other issues with IBC's, too including:
    • Uncertainty around their conents prior to you getting hold of them.
    • UV degradation of the plastic infill.
    • Their industrial aesthetic.
    To be candid, I've never seen an IBC fish tank that impressed me in terms of water quality.

    Now, as to whether they would be suitable for use in an iAVs context... the fact is that no-one really knows. While they are a long way from ideal, the better question might be to ask whether they can be made to work. Most of the issues that I've seen with IBC systems have more to do with the inadequacy of the gravel or clay pebbles as filtration media...than the IBC's themselves.

    It remains for someone to attempt their use...and to then report on their outcomes.
    It looks like that's about to be me. To that end, I'm currently building an IBC system in Vietnam...see HERE...and I propose to build one when I return to Australia. I want to know if I can overcome the issues that I have with them.
    "All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident." - Arthur Schopenhauer

    www.garydonaldson.net - my main website.

    https://www.facebook.com/gary.donaldson.161 - my Facebook page.

    https://www.facebook.com/groups/1167267703372756/ - my Microponics and Waste Transformation Farming Facebook Group

    https://www.facebook.com/groups/1318946951452383/ - my iAVs Facebook Group

    www.urbanaquaponics.com.au - the current home of the Online Urban Aquaponics Manual.

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    • #17
      I opted for a circular blue tank I found at my local feed store. The arms that spray the returning water not only help to add oxygen but also keeps the water circulating in a circular motion which helps the flow move toward the middle pipe. That pipe has slots cut in the bottom part for waste and water to move up and out to the two beds. The beds then drain into a sump tank which houses the pump which then returns the water to the fish tank. Seems to work well for me.

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      • #18
        The fish tank is good....particularly given your efforts to ensure that the tank 'swings'...directing the solids to the centre of the tank (and within reach of the solids lifting outlet). I like the craftsmanship that is apparent in your build. Indeed your whole system is good...provided that you replace the clay pebbles with iAVs-suitable sand.

        If, for whatever reason, that was not possible, the very least that you would need to do, in my opinion, is to incorporate some dedicated mechanical and biological filtration into the system. Your craftsmanship and investment of time and money deserves a better outcome than you will achieve with the basic media-based flood and drain system that you currently have.
        "All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident." - Arthur Schopenhauer

        www.garydonaldson.net - my main website.

        https://www.facebook.com/gary.donaldson.161 - my Facebook page.

        https://www.facebook.com/groups/1167267703372756/ - my Microponics and Waste Transformation Farming Facebook Group

        https://www.facebook.com/groups/1318946951452383/ - my iAVs Facebook Group

        www.urbanaquaponics.com.au - the current home of the Online Urban Aquaponics Manual.

        Comment

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