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  • hreid commented on LinkG4's instructable Aquaponics Vertical Garden3 days ago
    Aquaponics Vertical Garden

    I bristle at this sort of thought process. Scientists self police through peer review. We don't lie about our results because, if we do, our credibility is shot and we're ostracized from the community. Results are always based upon factual data. Data that doesn't agree with the business narrative simply isn't published (exxon scientists realized the global climate effect of fossil fuel use in the 70s, but it never came out because it hurts the brand). Published studies by real scientists, no matter their employer, are going to be inherently more accurate than some random person on the Internet telling you not too believe people who ACUTALLY HAVE DEGREES IN THE SUBJECT! It blows my mind that double blind studies are dismissed, but some random mother with no scientific degree on the Inter...see more »I bristle at this sort of thought process. Scientists self police through peer review. We don't lie about our results because, if we do, our credibility is shot and we're ostracized from the community. Results are always based upon factual data. Data that doesn't agree with the business narrative simply isn't published (exxon scientists realized the global climate effect of fossil fuel use in the 70s, but it never came out because it hurts the brand). Published studies by real scientists, no matter their employer, are going to be inherently more accurate than some random person on the Internet telling you not too believe people who ACUTALLY HAVE DEGREES IN THE SUBJECT! It blows my mind that double blind studies are dismissed, but some random mother with no scientific degree on the Internet railing against science she doesn't understand gains millions of followers who believe everything she says as gospel. Ludicrous!

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  • hreid commented on LinkG4's instructable Aquaponics Vertical Garden4 days ago
    Aquaponics Vertical Garden

    Aluminum can be toxic and leach out if the water is acidic. Galvanized metal has a zinc coating to it that is especially toxic to fish: "...In fact, using galvanized steel tanks is one of the major reasons that beginning aquaponic growers lose so many fish when they’re starting their systems."http://blog.brightagrotech.com/zinc-in-aquaponics/As to the question of phthalates and endocrine disruption: First, a fence post designed for outdoor exposure is almost certainly rigid PVC - this means that it contains ZERO plasticizers (phthalates are plasticizers). Second, certain phthalates have shown a mild causal relationship in fetal development of male RATS. The pathway is biologically impossible to reproduce in humans because of the way the liver and kidneys function in rats...see more »Aluminum can be toxic and leach out if the water is acidic. Galvanized metal has a zinc coating to it that is especially toxic to fish: "...In fact, using galvanized steel tanks is one of the major reasons that beginning aquaponic growers lose so many fish when they’re starting their systems."http://blog.brightagrotech.com/zinc-in-aquaponics/As to the question of phthalates and endocrine disruption: First, a fence post designed for outdoor exposure is almost certainly rigid PVC - this means that it contains ZERO plasticizers (phthalates are plasticizers). Second, certain phthalates have shown a mild causal relationship in fetal development of male RATS. The pathway is biologically impossible to reproduce in humans because of the way the liver and kidneys function in rats. Endocrine disruption by phthalates is unlikely to occur in an aquaponics system. Other phthaltes are specifically used because they provide a benefit (dioctyl phthalate is used in blood bags because it improves longevity of red blood cells).It's not the plasticizers in PVC products that are harmful and prohibit a product from being food grade. It's the possible presence of pvc monomer and the stabilizers used. The amount of monomer present in food grade products is highly monitored, as it can lead to a specific kind of cancer. Stabilizers in outdoor plastics are possibly going to be lead-based, especially if they're manufactured outside of the US.

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