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Thread: Best Way to Remove High # of Heavy Metals

  1. #1
    Join Date
    Oct 2004
    Camby, Indiana

    Best Way to Remove High # of Heavy Metals

    We've been having slight issues with our fish all spring. We have scraped and scoped, nothing other than gill flukes once and found 1 anchor worm. We've ruled out everything else after doing 2 months of detective work and are strongly suspecting continous exposure to metals, specifically magnesium, iron, and copper are causing our issues.

    We currently run our water through a carbon filter, but am realizing that it's not removing everything. We need to remove more of the metals.

    However, we're being told to use RO units to remove the metals, but have also been told RO units in the long run can cause issues as well.

    So, the question is, how to best remove metals from the pond without having long term consequences?

    Tamara Skaggs
    NMZNA Koi & Goldfish Show and Pond Expo - Indianapolis
    June 19-21, 2009
    Season's Gardens in Fishers, IN

  2. #2
    Join Date
    Sep 2006
    I use polyfilter ( a poly material impregnated with a resin). You can order it at any tropical fish mail order house in bulk - usually about $6 a pack if you order by the dozen. Place three in the leaf basket of the pump and they will turn from white to blue overnight if you have iron and copper present. I would still get a copper kit for $6 and make sure that the levels are gone.
    I'd also send a same to the town as they are not great at testing in general but good for metals and bacteria count. Best of luck. JR

  3. #3
    Join Date
    Oct 2004
    Camby, Indiana
    Our subdivision has its own water conservatory company; we get our water through from Indpls. The lady that runs the conservatory out here (does the testing, etc) works quite a bit with Marc. I just got off the phone with her. When she does a copper test, she picks 10 homes and reports the 2nd highest level. That level is .282 ppm. When we had the water test done on our pond water (after it ran through a carbon filter) we were at .0005 ppm. We've sent out new tests because our source well changed. The lady that does the testing for copper and lead is putting our house on her test list for every year so we'll know our exact levels.

    Thanks for the info.


  4. #4
    Oyagoi bekko's Avatar
    Join Date
    Sep 2004
    Adding EDTA (ethylenediaminetetraacetic acid) is the cheapest and most effective way to get rid of heavy metals. Well.... it doesn't really get rid of them but it chelates them so that are not bio-active.

    Magnesium and iron will form a stable precipitate when exposed to oxygen through aeration and are unlikely to do any harm. 0.3 ppm copper is enough to kill them within a month at low pH in soft water. High alkalinity will help protect the koi from copper toxicity.


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