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Thread: No algae but water has a green tint

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    No algae but water has a green tint

    Hi all,

    this is my second year managing my pool and last year was fairly easy thanks to TFP.

    my water is clear but has a strong green tint to it, and based on what I have read here I suspect that it is a copper issue.

    my overnight FC loss was 0 and I a have a heater that has not been working.

    i have several questions

    Can I assume based on the he above information that green color is from copper?

    How do I deal with the issue to get the pool back to blue.

    It seems like there is a knob on the heater pipes to divert the water but I am not familiar enough with the equipment. Is it possible that I need to open another valve if I close the heater valve. Just afraid I might break my equipment..

    FC 3.5
    PH 7.8
    CH 375
    TA 210
    CYA 55

    Thanks!
    30,000 gallon gunite pool, cartridge filter, heater, Polaris

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    Divin Dave's Avatar
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    Re: No algae but water has a green tint

    If the water is clear, but tinted green then its most likely copper.

    Many algaecides use copper as an algae inhibitor. That is a primary source of copper, so if you've been using it, then you might want to reconsider that product.

    It could also be caused by old copper heater pipes, and if the ph gets high, like +8, that will just make the copper from the pipes disolve into the water faster.

    Whether or not you have a heater bypass depends on how the equipment was plumbed, etc. If you could post a picture of the plumbing, we could tell you. If there is not a bypass valve, then the alternative would be to re-do the plumbing to bypass the heater.

    Im not much of a copper expert, but Im sure someone with more knowledge on how to deal with it will come along.
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
    www.tftestkits.net Experience- it's what's learned just after you needed it most !!

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    Zappafan's Avatar
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    Re: No algae but water has a green tint

    Pictures are a good start. Then you can start to eliminate potential issues.
    17K Gallon,IG Vinyl,1hp Pentair Challenger,Pentair TA60 Sand Filter, Hayward Colorlogic,Re-lined 06-20-15, TF-100,SpeedStir,Lagunitas and Margaritas. Zappafan Pool Build

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    Re: No algae but water has a green tint

    image.jpg
    Heres a picture of my heater.
    thanks
    30,000 gallon gunite pool, cartridge filter, heater, Polaris

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    Re: No algae but water has a green tint

    How about a picture of that green water?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: No algae but water has a green tint

    image.jpg
    Sorry it's up side down... can't figure out how to flip it but colors the same.

    thanks
    Attached Images Attached Images
    30,000 gallon gunite pool, cartridge filter, heater, Polaris

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    Pflugerpool's Avatar
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    Re: No algae but water has a green tint

    How did you arrive at that CYA number? Because if your CYA is really 55, then your minimum FC level is above 4, and since you're below that at 3.5 you might very well have algae.
    15,000 gallon 16x30 IG w/vinyl liner built in 2006, Hayward cartridge filter, Hayward 1HP Single Speed pump, Taylor K2006.

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    Re: No algae but water has a green tint

    I generally keep my FC 5-7 but I wanted to an overnight chlorine test so I didn't add chlorine until this morning. There was no overnight chlorine loss so I assume no algae. FC is higher now since I added bleach after I tested.

    i have TF-100 test kit.
    30,000 gallon gunite pool, cartridge filter, heater, Polaris

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    Re: No algae but water has a green tint

    1. did the water turn green suddenly or has it always been like that?

    2. Get a copper test at a pool store - don't buy anything - report the results.

    Don't assume even then that it is or isn't copper but it's a starting point to getting your pool back to clue.

    Confirming again, you lost less than 1 ppm FC last night, correct?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: No algae but water has a green tint

    I noticed a little green tint on Friday and it has been getting stronger since.

    should I try to bypass the heater and run the pump? I am not running the pump now.

    Looks like there is a valve on the heater pipes. Just wondering if I close that valve, would there be another valve somewhere in the system that would need to be opened?
    30,000 gallon gunite pool, cartridge filter, heater, Polaris

  11. Back To Top    #11

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    Re: No algae but water has a green tint

    I just went to a pool store and they said there's no copper in the water. She kept saying that Theres an algae problem. Is it possible that there's algae but no chlorine loss overnight?

    should I look into any other possibilities?

    there is nothing growing on the walls...


    thank you
    30,000 gallon gunite pool, cartridge filter, heater, Polaris

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    Pflugerpool's Avatar
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    Re: No algae but water has a green tint

    Quote Originally Posted by Jacks mom View Post
    should I try to bypass the heater and run the pump? I am not running the pump now.
    Whatever the problem is, I would think that it would be much harder to deal with if you don't have a running pump. You've got to be able to circulate water though the system.
    15,000 gallon 16x30 IG w/vinyl liner built in 2006, Hayward cartridge filter, Hayward 1HP Single Speed pump, Taylor K2006.

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    Re: No algae but water has a green tint

    Quote Originally Posted by Jacks mom View Post
    .......................... my overnight FC loss was 0 and I a have a heater that has not been working.........

    FC 3.5
    PH 7.8
    CH 375
    TA 210
    CYA 55
    Quote Originally Posted by Jacks mom View Post
    I generally keep my FC 5-7 but I wanted to an overnight chlorine test so I didn't add chlorine until this morning. There was no overnight chlorine loss so I assume no algae. FC is higher now since I added bleach after I tested.

    i have TF-100 test kit.
    These are confusing statements...... You say your FC is normally 5-7ppm, but you post a FC of 3.5ppm and say that is because of an OCLT?

    If your FC is normally 5-7ppm and now it's 3.5ppm that's a 1.5-3.5ppm loss, or you started at 3.5ppm and left it like that for 8-10 hours?

    Regardless, you are letting your FC drop below min, which is an invitation to an algae party.

    Also, you show a CYA of 55ppm, how did you determine that? Is it an assumption because it was right between 50-60ppm? If so, it is most likely closer to 60ppm, making that FC at 3.5ppm even more detrimental.

    Can you post your FC levels at the start of the OCLT & at the finish of the OCLT?

    Dom
    Dom - TFP Guide
    Intex 18' X 48" Ultra Frame AGP 6700 gallons | Two Intex CS8110 SWG's | Hayward Pro Series 21" Sandfilter | Hayward 1.5HP Power Flo Matrix pump | Hayward Thru-wall Skimmer | Wanda the Whale | 72 sq ft of Sungrabber Solar Panels with Hayward GLC-2P-A | Taylor K2006 Test Kit, Sample Sizer & Speed Stir | Click Here To Become a TFP Supporter!

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    Re: No algae but water has a green tint

    I would perform another OCLT to be sure and this time check your CC.
    Combined Chlorine of greater than .5ppm indicates a problem. If your CC is .5 or less and you lose less than 1 ppm FC overnight, then at least you could be relatively sure there is no algae.
    When I did my SLAM, I did the OCLT 3 nights in a row just to be sure.
    The people here can help you. Good Luck.
    Ant
    16'x48" Summer Escapes Pro-Series, AG, Ultra-Frame, Intex CS15110 Sand filter/SWG, 5061 GAL, TF-100 Test Kit w/ K-1766 Salt Test and Speedstir.
    Pool School, ABC's of Water Chemistry, CYA/Chlorine Chart, Water Balance for SWG's, Pool Math.

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    Re: No algae but water has a green tint

    Quote Originally Posted by aboykin2269 View Post
    I would perform another OCLT to be sure and this time check your CC.
    Combined Chlorine of greater than .5ppm indicates a problem. If your CC is .5 or less and you lose less than 1 ppm FC overnight, then at least you could be relatively sure there is no algae.
    When I did my SLAM, I did the OCLT 3 nights in a row just to be sure.
    The people here can help you. Good Luck.
    +1

    This time raise your FC to 10ppm for the test due to your CYA level. Check the FC at sunset, at least 30 min after the addition of any chlorine. Check again before sunup, ideally 7-8 hours after the initial FC reading the night before.

    Dom
    Dom - TFP Guide
    Intex 18' X 48" Ultra Frame AGP 6700 gallons | Two Intex CS8110 SWG's | Hayward Pro Series 21" Sandfilter | Hayward 1.5HP Power Flo Matrix pump | Hayward Thru-wall Skimmer | Wanda the Whale | 72 sq ft of Sungrabber Solar Panels with Hayward GLC-2P-A | Taylor K2006 Test Kit, Sample Sizer & Speed Stir | Click Here To Become a TFP Supporter!

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