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Thread: Why is my water blue?

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    Join Date
    Jun 2013
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    Central Illinois
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    Why is my water blue?

    I know, I know, everyone wants blue water and I have blue water. My question is why the water is blue? My wife swears that even the water in the spray fountain looks light blue when it is in the air.

    FC runs 1-3 depending on time of day. (add at night/dusk/when I get home from work)
    pH ranges between 7.5 and 7.8. (I have to add M.Acid each day to bring back down. I assume this is due to the fountain always running and aeration raising pH)
    TA is usually high, around 240 or so. Has been ever since filling a few weeks ago.
    CYA is around 30-40

    When I first filled the pool, I had clear water, but green tint. The town water guy said we have heavy iron in the area, so I added about 24 oz of a metal out product, two bags of di-clor shock, and a few oz of a "super clarifier" all a few hours apart. Now understand, I had no idea what I was doing, just reading backs of bottles at wally-world and hoping it would fix what might be my problem. The pool tint got a lot lighter green, but still green. The test strips kept showing high pH, so I would dump a cap full or so of "ph minus" into the pool, but would stay high. I found somewhere about doing an "acid shock" to bring down TA, so I dumped most of the rest of the bottle (about 4lbs) of pH-minus into the pool. pH came down to about 7.5. FC still showing 0 or darn close everytime I tested, so added another bag of shock. The green tint (always clear, not algae) went away for the most part and pool looked very clear and clean.

    Then I found TFP and the pool calculator. I put in my levels, added what was needed and got things right. Green went the rest of the way away and water turned nice and blue. I add about 12 oz of M.Acid, and 30 oz of 10% Liquid Shock daily to keep things at about the levels above. Eyes don't burn anymore, water is beautiful. Wife very happy.

    But I am left with the question: Any idea why the water looks blue?
    8K Gal, Intex 20' X 48" Ultra Frame Round Pool (PVC Liner), Cartridge Filter
    First pool setup 6/17/13
    I am both a newbie and a cheapskate. Please forgive my stubbornness and ignorance.
    Mental Note: Shocking the Pool does not involve an electric cord...

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    mas985's Avatar
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    May 2007
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    Re: Why is my water blue?

    There is a web site for that: whyiswaterblue.com

    Or did you mean that in a glass indoors, the water still has a blue tint?
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

  3. Back To Top    #3

    Join Date
    Jun 2013
    Location
    Central Illinois
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    Re: Why is my water blue?

    no, not why is water in general blue. there seems to be a slight blue tint to the water even in a glass...
    8K Gal, Intex 20' X 48" Ultra Frame Round Pool (PVC Liner), Cartridge Filter
    First pool setup 6/17/13
    I am both a newbie and a cheapskate. Please forgive my stubbornness and ignorance.
    Mental Note: Shocking the Pool does not involve an electric cord...

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    chiefwej's Avatar
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    Jun 2011
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    Tucson
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    Re: Why is my water blue?

    Copper will cause a blue tint. Did anyone put copper algaecide in it?
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

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    JasonLion's Avatar
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    May 2007
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    Re: Why is my water blue?

    Quote Originally Posted by chiefwej
    Copper will cause a blue tint. Did anyone put copper algaecide in it?
    While copper can color water blue, it doesn't normally do so in a swimming pool. If you get any color at all from copper, it is far more likely to be emerald green.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Join Date
    Jun 2013
    Location
    Central Illinois
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    Re: Why is my water blue?

    No algaecide... but that doesn't mean the town water I filled with didn't have any copper in it...
    8K Gal, Intex 20' X 48" Ultra Frame Round Pool (PVC Liner), Cartridge Filter
    First pool setup 6/17/13
    I am both a newbie and a cheapskate. Please forgive my stubbornness and ignorance.
    Mental Note: Shocking the Pool does not involve an electric cord...

  7. Back To Top    #7
    mas985's Avatar
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    Re: Why is my water blue?

    Is the water cloudy at all or have any suspended particulates?

    You might want to pm chem geek. He has a pretty deep background in chemistry and he might have some ideas on what it could be.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

  8. Back To Top    #8

    Join Date
    Mar 2007
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    San Rafael, CA USA
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    Re: Why is my water blue?

    The water should not look blue in a clear glass of pool water. In a pool, yes, because the redder wavelengths of light are absorbed 100 times more than the bluer ones, but it takes a reasonable water depth before one sees that effect. One normally doesn't see that in just a glass of water. Try another glass or plastic material just to make sure the glass itself isn't slightly tinted and also compare against tap water in the same glass.

    If you've got fine suspended particles, then that can sometimes look more blue than gray since blue light is scattered more easily and is what makes the sky look blue, but this would be rather unusual to again be visible in such a small volume of water. Usually such scattering makes water look cloudy.

    As noted here, high copper levels can make water look blue-green.
    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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