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Iron removal from domestic water ?

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  • Iron removal from domestic water ?

    only slightly off topic, since I'm off grid, I don't have oodles of power to run large pumps for backwashing filters.

    I seasonally get iron in my water, and need to remove it before the main filtering. Research I've done shows that "greensand" style filters can trap the iron and then be backwashed with potassium permanganate and then returned to use. (much like a water softener and brine)

    I have limited power and pressure (and water) for backwashing, and wondering if anyone has solved an issue like this ?

    I'm hoping a mild pressure and let it soak overnight might work for the backwash/recharge ?
    Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
    || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
    || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

    solar: http://tinyurl.com/LMR-Solar
    gen: http://tinyurl.com/LMR-Lister

  • #2
    Mike I am not certain, but I do not think you can get away from Back Washing. However you can reduce the frequency, but no need to chemical regeneration is required by aerating the water to oxygenate it. Like an Aquarium. Issue again is power required. I don't have the answer, but I know the right answer; Whatever method requires the least amount of energy.

    I think there are mechanical filters made for heavy metals, but those can be expensive and require frequent replacement. Let your wallet decide what the right answer is. Your wallet is smarter than the two of us put together.
    MSEE, PE

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    • #3
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      Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
      || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
      || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

      solar: http://tinyurl.com/LMR-Solar
      gen: http://tinyurl.com/LMR-Lister

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      • #4
        We had a newer Rainsoft softener installed a couple of years ago and it uses about 1/10 the salt the old one did so I'm going to assume it uses less water as well. There is no pump as everything runs off water pressure and the controller just tells the valves what to do.

        Could you just run the water through something with magnets in it? When I was growing up our water (before softener) was so hard that if you let a 12 oz glass of it sit overnight there would be layer of red iron oxide on the bottom. Never did think to see if the stuff would stick to a magnet.

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        • #5
          Originally posted by Justin B. View Post
          Could you just run the water through something with magnets in it? .
          It is iron oxide which has no ferrous metal in it. Magnets are worthless. You have to use Ion exchange to remove it, or I should say replace it with something else.
          Last edited by Sunking; 11-06-2018, 06:33 PM.
          MSEE, PE

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          • #6
            Oh well, it was a WAG so I guess he's stuck with a softener of some sort and the associated back flushing...

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            • #7
              Found this...

              https://www.technologyreview.com/s/4...h-nanomagnets/

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