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Thread: Green/aqua tint to water - out of ideas

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    Green/aqua tint to water - out of ideas

    Quick specs: 18k gallon SWG pool. My water seems to have a green/aqua tint to it that I can't cure. Upon opening my pool this year, I did my usual routine:

    1. install filters used only for first few days of opening
    2. keep CF at 14 until overnight test shows no drop in FC
    3. replace opening filters with "rest of the season" filters once chemistry is correct. same model filters.

    I recently ran at FC 14 for five straight days and there was no change in the color of the water. The deep end is noticeably more aqua than the shallow end. My current readings are:

    FC: 10
    CC: 0
    pH: 7.2-7.5
    TA: 100
    CH: 40
    CYA: 30 (in the process of getting this back up to recommended levels)
    Salt: 3300 PPM
    Temp: I had it at 80 after the warm weather, but then it dropped to 64 as I was up at FC 14 for the last five days. D'oh!

    Here is a picture of the water, taken this morning. The photo may not accurately portray what I am seeing (iPhone photo)... but I assure you the water doesn't look 100% normal:



    Any suggestions on what I should try? Thanks!
    16x34 Oasis IG Liner Pool with Cozy Cove, Sta-Rite s7m120 Mod Media Filter (1 hp), Sta-Rite Max-E-Pro Pump, Sta-Rite Max-E-Therm Heater, LED lights, Hayward Goldline Aqua-Rite SWG (T-15 Cell) and TF-100 Test Kit

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    Richard320's Avatar
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    Re: Green/aqua tint to water - out of ideas

    Did you ever add any copper-based algaecides?

    Did the pH ever get dangerously low, like below the bottom of the scale?

    Have you run an overnight chlorine loss test to ensure there's nothing growing in the water?
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Green/aqua tint to water - out of ideas

    Well, in the pic, your pool looks fairly normal but here's what I think is occurring.....

    You have some iron in your pool that has precipitated out of solution. The yellowish now visible iron is combining with the blue of your water and giving you a greenish cast.

    Based on that pic. I would do nothing and let it come out on it's own. Elevated chlorine usually is the root cause so let your FC drop back to around 3-6 ppm and hold it there.

    If it doesn't return to normal after a week or so, then you will likely need to add a sequestrant but I wouldn't go there just yet......I think it will solve itself. Keep your filter running and don't be surprised if your filter picks up that yellowish/brownish iron.......that's what it's supposed to do.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: Green/aqua tint to water - out of ideas

    Quote Originally Posted by duraleigh View Post
    Well, in the pic, your pool looks fairly normal but here's what I think is occurring.....

    You have some iron in your pool that has precipitated out of solution. The yellowish now visible iron is combining with the blue of your water and giving you a greenish cast.
    Thank you. We do have high levels of iron in our water here. I haven't filled from the hose yet this year, but I did late last year. Perhaps that is to blame here. I will do as you advised and give it a week.

    To the other poster... no, I did not use any algaecide. And the pH has been in the 7.2-7.8 range since opening. Overnight test shows a stable FC level.
    16x34 Oasis IG Liner Pool with Cozy Cove, Sta-Rite s7m120 Mod Media Filter (1 hp), Sta-Rite Max-E-Pro Pump, Sta-Rite Max-E-Therm Heater, LED lights, Hayward Goldline Aqua-Rite SWG (T-15 Cell) and TF-100 Test Kit

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    Mod Squad JohnT's Avatar
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    Re: Green/aqua tint to water - out of ideas

    The bottom of your pool sure looks like it has metal stains on it.
    TFP Moderator
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    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Richard320's Avatar
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    Re: Green/aqua tint to water - out of ideas

    Then we can rule out algae and copper. So it looks like Iron.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Green/aqua tint to water - out of ideas

    Quote Originally Posted by JohnT View Post
    The bottom of your pool sure looks like it has metal stains on it.
    This is of interest to me... I've noticed the edges of the liner seems to be yellowing a bit. I also have a bit of discoloration on my steps and cove. Is this related to metal in the water? Is the staining permanent?

    To be honest, I have not researched issues with metal in water. I do have some StainFree that I picked up when the pool was first installed. Not sure which direction to take if that is what is leaving a yellow-ish tint on my liner.
    16x34 Oasis IG Liner Pool with Cozy Cove, Sta-Rite s7m120 Mod Media Filter (1 hp), Sta-Rite Max-E-Pro Pump, Sta-Rite Max-E-Therm Heater, LED lights, Hayward Goldline Aqua-Rite SWG (T-15 Cell) and TF-100 Test Kit

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    Re: Green/aqua tint to water - out of ideas

    Quote Originally Posted by racharoow View Post
    This is of interest to me... I've noticed the edges of the liner seems to be yellowing a bit. I also have a bit of discoloration on my steps and cove. Is this related to metal in the water? Is the staining permanent?

    To be honest, I have not researched issues with metal in water. I do have some StainFree that I picked up when the pool was first installed. Not sure which direction to take if that is what is leaving a yellow-ish tint on my liner.
    I'm talking about the distinct color difference in the marked area below:

    IMG_0378.jpg
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Re: Green/aqua tint to water - out of ideas

    Quote Originally Posted by JohnT View Post
    I'm talking about the distinct color difference in the marked area below:

    IMG_0378.jpg
    Oh, that's actually the reflection of the trees surrounding our property. We're surrounded by huge trees and what you're seeing there is the blue sky.

    Here's the full-res image -> https://lh3.googleusercontent.com/-E...8/IMG_0378.JPG
    16x34 Oasis IG Liner Pool with Cozy Cove, Sta-Rite s7m120 Mod Media Filter (1 hp), Sta-Rite Max-E-Pro Pump, Sta-Rite Max-E-Therm Heater, LED lights, Hayward Goldline Aqua-Rite SWG (T-15 Cell) and TF-100 Test Kit

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    Re: Green/aqua tint to water - out of ideas

    Quote Originally Posted by racharoow View Post
    Oh, that's actually the reflection of the trees surrounding our property. We're surrounded by huge trees and what you're seeing there is the blue sky.

    Here's the full-res image -> https://lh3.googleusercontent.com/-E...8/IMG_0378.JPG
    Good! I was actually thinking "How the heck did they not notice the stain?"
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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