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Thread: at what PPM do iron stains start to show?

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    at what PPM do iron stains start to show?

    at what PPM do iron stains start to show?
    15,000 gallon inground fiberglass pool with spa. 350lb Sand filter, 1.5 hp pump, and heater

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    Re: at what PPM do iron stains start to show?

    I think any level above 0 can cause staining if it is untreated.
    27' Round Might Sun AG Pool 18000 Gallon Intex Krystal Clear SWG Hayward Pump/Filter on a Timer

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    Re: at what PPM do iron stains start to show?

    .3ppm is a general rule of thumb. (Yes, that's [point 3ppm], not 3ppm)
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: at what PPM do iron stains start to show?

    And it's a function of pH as well as iron concentration. Even levels lower than 0.3 ppm can stain if the pH gets much above 8.0
    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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