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Thread: how much manganese is bad in a pool

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    how much manganese is bad in a pool

    Using well water for pool fill
    In the well water manganese is .09 ppm
    Is this too much? What is too much?
    Searched but could not find levels, maybe I missed
    IG under fir trees and one cherry surrounded by grass built in 1979, 30k, plaster, old Sta-Rite HRPB30, 4.9 sq.ft, 20 GPM/sq.ft., but with new glass, new (in 2012) 1 HP WhisperFlo one speed, new (in 2013) Rainbow tab chlorinator attached at the top, old Maxi-Flo Heat Exchanger MF-260, Burnham V7 oil heater 245 MBH, new (in 2012) Compool to Easytouch, Taylor K-2005 and TF-100.

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    Re: how much manganese is bad in a pool

    We don't have a definitive level where staining would become a problem, mostly because it's far less common than iron and copper staining. Nevertheless, according to this paper the solubility of oxidized manganese as black/brown manganese dioxide (MnO2) is roughly 0.1 ppm Manganese at pH 7.0 and increases in solubility to 0.3 ppm at pH 8.4. This 0.1 ppm is also roughly the limit for when unoxidized manganese might precipitate as light gray manganese carbonate (MnCO3) at high pH (8.0). The manganese dioxide can also get oxidized by chlorine to permanganate ion (MnO4-) which is purple in color.

    So I would bet that you are OK though on the edge at 0.1 ppm but note that if you use your well water for refilling after evaporation that the manganese level could climb over time.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
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    Re: how much manganese is bad in a pool

    Thank you, got it

    We have had the well water tested. I think I will scoop up some pool water and have manganese measured.

    If I pay the freight for manganese I might as well add iron and copper. Should I measure any others while at it?
    IG under fir trees and one cherry surrounded by grass built in 1979, 30k, plaster, old Sta-Rite HRPB30, 4.9 sq.ft, 20 GPM/sq.ft., but with new glass, new (in 2012) 1 HP WhisperFlo one speed, new (in 2013) Rainbow tab chlorinator attached at the top, old Maxi-Flo Heat Exchanger MF-260, Burnham V7 oil heater 245 MBH, new (in 2012) Compool to Easytouch, Taylor K-2005 and TF-100.

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    Re: how much manganese is bad in a pool

    For metals that can cause staining, those are the three to worry about.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    Re: how much manganese is bad in a pool

    Quote Originally Posted by chem geek View Post
    For metals that can cause staining, those are the three to worry about.
    thanks, got it
    will order 'em up
    IG under fir trees and one cherry surrounded by grass built in 1979, 30k, plaster, old Sta-Rite HRPB30, 4.9 sq.ft, 20 GPM/sq.ft., but with new glass, new (in 2012) 1 HP WhisperFlo one speed, new (in 2013) Rainbow tab chlorinator attached at the top, old Maxi-Flo Heat Exchanger MF-260, Burnham V7 oil heater 245 MBH, new (in 2012) Compool to Easytouch, Taylor K-2005 and TF-100.

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    Re: how much manganese is bad in a pool

    results are back
    Cu Fe and Mn are ND, not detectable; cool
    but a puzzle
    if the fill well water is .09 Mn how can the pool be ND Mn?

    - - - Updated - - -

    from the web
    "Essentially, the oxidizing agent (chlorine) causes rapid oxidation or "rusting" of the dissolved iron and manganese causing it to precipitate out of the water and turn into a solid particle. The particle is then mechanically filtered out of the water."
    maybe this is where the Mn went
    IG under fir trees and one cherry surrounded by grass built in 1979, 30k, plaster, old Sta-Rite HRPB30, 4.9 sq.ft, 20 GPM/sq.ft., but with new glass, new (in 2012) 1 HP WhisperFlo one speed, new (in 2013) Rainbow tab chlorinator attached at the top, old Maxi-Flo Heat Exchanger MF-260, Burnham V7 oil heater 245 MBH, new (in 2012) Compool to Easytouch, Taylor K-2005 and TF-100.

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    Re: how much manganese is bad in a pool

    The oxidized manganese is still slightly soluble as I noted in my post so it shouldn't have precipitated and filtered out since you started with such a low level. If such testing were free, I'd send them a sample of your well water to see if they detect the 0.09 ppm manganese in it. At any rate, it sounds like you don't have anything to worry about.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    Re: how much manganese is bad in a pool

    Quote Originally Posted by chem geek View Post
    If such testing were free, I'd send them a sample of your well water to see if they detect the 0.09 ppm manganese in it. At any rate, it sounds like you don't have anything to worry about.
    Not free but not so much so will have well water re-tested.

    Thank you.
    IG under fir trees and one cherry surrounded by grass built in 1979, 30k, plaster, old Sta-Rite HRPB30, 4.9 sq.ft, 20 GPM/sq.ft., but with new glass, new (in 2012) 1 HP WhisperFlo one speed, new (in 2013) Rainbow tab chlorinator attached at the top, old Maxi-Flo Heat Exchanger MF-260, Burnham V7 oil heater 245 MBH, new (in 2012) Compool to Easytouch, Taylor K-2005 and TF-100.

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    Re: how much manganese is bad in a pool

    Mn value in well water returned, .057
    barely above established contamination level of .05
    will cease thinking about metals
    thank you all
    IG under fir trees and one cherry surrounded by grass built in 1979, 30k, plaster, old Sta-Rite HRPB30, 4.9 sq.ft, 20 GPM/sq.ft., but with new glass, new (in 2012) 1 HP WhisperFlo one speed, new (in 2013) Rainbow tab chlorinator attached at the top, old Maxi-Flo Heat Exchanger MF-260, Burnham V7 oil heater 245 MBH, new (in 2012) Compool to Easytouch, Taylor K-2005 and TF-100.

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    Re: how much manganese is bad in a pool

    ^ I want your well. Just sayin
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