RO Water Advice

Discussion in 'Water Parameters and Additives' started by bushman, 12 Oct 2009.

  1. bushman

    bushman

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    In this hobby there is always osmething else.

    I am really struggling with water quality ie RO water. I just cant keep down the ppm. See below

    "I am hoping anyone can assist.

    I live out in the Kruger National Park and run a huge Marine Fish Tank. The tank has been very costly and has taken about 2 years to set up. While I do everything I can the tank will just not go to the next level. On investigation it turned out its my water.

    I current have 120 litres of resin to soften my water , this is then pumped by small pressure pump through 6 filters ranging from Micro filters up to carbon. The water is then pushed through 2 x RO membranes one high volume and one standard volume. The water is then sent through another 2 litres of DI resin and the final result at best is about 11pm and rises to 30ppm before I do a full back wash and flush.

    My actual water is pumped from boreholes and ranges in total hardness from 1800pm up to 2300pm in the dry season.

    I am desperate to resolve this problem as I have started losing some very expensive corals due to water quality.

    I need my water to come out with 0ppm and climb to no higher than 5ppm. I need to produce a min of 50 litres per day but would prefer about 200 litres per day.

    I was told on Friday that I should install a salt water RO membrane and unit. I need help either way, I would like to find a cost effective solution if possible."


    If anyone can help and has sound knowlledge and costs I need help soon before I loose my lovely new SPS corals.
     
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  3. mariusmeyer

    mariusmeyer

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    I personally think there is something else wrong and that it is not the RO water. 11ppm is still quite low. If you can give a complete description of the tank plus the filtration and livestock you have I reckon the guys on here will be able to help.
     
  4. Mathewis

    Mathewis

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    marius 11ppm is way to high imo.
     
  5. Stressed Eric

    Stressed Eric

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    Yoh, a 2000 ppm turbidity coming in is huge ! I'm in the water industry and clearly you need some sort of pre filtration before hammering your membranes like you are. I would invest in a few jojo tanks and make them into clarifiers by dosing a flocculant like aliminium sulphate to adhere to the suspended solids and skimming the surface for clarified water, then maybe passing it through a simple pool gravel filter before your existing filtration system. Hope this helps :)
     
  6. IMarine

    IMarine

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    Hi Bushman you get ro units that is designed for water that comes out of boreholes,i now that they pricey around R10000 i have seen them in action
     
  7. OP
    bushman

    bushman

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    Location:
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    Here is a water test that I had done some years ago on the borehole water, but I am sure it has not changed too much.

    Results show

    Ph 7.45
    Total dissolved solids mg/l 1068
    Conductivity Ms/m 146
    Tot.Alk.as CaCO3 mg/l 540
    Tot Hard mg/l 514
    Ca Hard 75
    Mg Hard 439
    Lang Index@25deg .20
    Sod.Abs.Ratio 2.43
    Calcium as Ca mg/l 30
    Magneium as Mg mg/l 107
    Sodium as Na mg/l 127
    Chloride as Cl mg/l 165
    Tot Viab.Org- Col/100ml TNTC

    The tanks water is exellent

    PH 8.3- 8.4
    Nitrates 0
    Nitrites 0
    Amonia 0
    Phospates 0
    Calcium 450ppm
    Magnesium 1350ppm
    dkh 9


    Temp 27.3 consistant


    So the tanks okay its the RO water feeding the tank that is the problem.

     
  8. crispin

    crispin

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    have u chatted to marco, "the waterboy"?
     
  9. OP
    bushman

    bushman

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    Just given him a call, he will look into it.
     
  10. Sammy

    Sammy

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    Just bought the RO Reef master from Marco and the service is excellent !
     
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