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Thread: Blue Granular Residue in Pool

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    Join Date
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    Blue Granular Residue in Pool

    New user. Love the site. First month in taking over for my "pool guy". Question:

    I am finding a small amount of a light blue, granular (grains the size of very course salt or sand) substance in my skimmer bag and some quantities in the bottom of the pool. Any idea what exactly that is?

    I haven't added salt (or anything else) in almost two weeks.

    I am getting ready to add some Muratic Acid tonight as my pool seems to be a bit toward the potential scaling side. (I have also noticed a small amount of scaling on the bottom of the metal cross bar of my electric pool cover. This may have been there for several months.)

    Latest tests: FC/TC: 5+, pH 7.8, TA 150, CH 430, CYA 50, Salt 2800
    18,000 gallons - IG; Built: June, 2010
    Easytouch panel; Intellichlor IC40 ECG; Pentair cartridge filter: CCP 420
    Pebbletec (Tahoe Blue); Pump-Pentair Challenger, 346201, CHII-NI-2A, 2hp, 2" x2"
    Electric Cover (always closed when not using); Geothermal Heater
    Polaris UltraFlex2, in-pool cleaning system; Levolor Electronic water fill system

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    duraleigh's Avatar
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    Re: Blue Granular Residue in Pool

    What else is blue in and around the pool? Could it be coming from there?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Mod Squad JohnT's Avatar
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    Re: Blue Granular Residue in Pool

    Pool noodles getting old?

    Are the granules hard or soft?
    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: Blue Granular Residue in Pool

    Nothing else blue around the pool that I can think of. It's weird to me. Sort of a pale blue, hard, granular substance. In a week, I might get an ounce or two out of the skimmer bag. Hard to tell the quanitity that I sweep toward the drain once a week. Maybe another few ounces.
    18,000 gallons - IG; Built: June, 2010
    Easytouch panel; Intellichlor IC40 ECG; Pentair cartridge filter: CCP 420
    Pebbletec (Tahoe Blue); Pump-Pentair Challenger, 346201, CHII-NI-2A, 2hp, 2" x2"
    Electric Cover (always closed when not using); Geothermal Heater
    Polaris UltraFlex2, in-pool cleaning system; Levolor Electronic water fill system

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    Re: Blue Granular Residue in Pool

    We do have some pool noodles and they are blue and no longer new. These grains are hard though. About the consistency of salt crystals but larger. Not ruling out the noodles but a) they haven't been in the pool at all in the last week and b) the substance is way harder than what a noodle feels like.
    18,000 gallons - IG; Built: June, 2010
    Easytouch panel; Intellichlor IC40 ECG; Pentair cartridge filter: CCP 420
    Pebbletec (Tahoe Blue); Pump-Pentair Challenger, 346201, CHII-NI-2A, 2hp, 2" x2"
    Electric Cover (always closed when not using); Geothermal Heater
    Polaris UltraFlex2, in-pool cleaning system; Levolor Electronic water fill system

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    linen's Avatar
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    Re: Blue Granular Residue in Pool

    Can you post a close up pic of the granules?

    Just a guess, but if you have had other scaling, then I would guess it's calcium related. Getting your TA and ph down will help with the scaling.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: Blue Granular Residue in Pool

    I will try and take a picture to post tonight when I get home. Thanks!
    18,000 gallons - IG; Built: June, 2010
    Easytouch panel; Intellichlor IC40 ECG; Pentair cartridge filter: CCP 420
    Pebbletec (Tahoe Blue); Pump-Pentair Challenger, 346201, CHII-NI-2A, 2hp, 2" x2"
    Electric Cover (always closed when not using); Geothermal Heater
    Polaris UltraFlex2, in-pool cleaning system; Levolor Electronic water fill system

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    Re: Blue Granular Residue in Pool

    Okay, here is a picture of the mystery substance (and some spider parts and dog hair). Any clues?
    Attached Images Attached Images
    18,000 gallons - IG; Built: June, 2010
    Easytouch panel; Intellichlor IC40 ECG; Pentair cartridge filter: CCP 420
    Pebbletec (Tahoe Blue); Pump-Pentair Challenger, 346201, CHII-NI-2A, 2hp, 2" x2"
    Electric Cover (always closed when not using); Geothermal Heater
    Polaris UltraFlex2, in-pool cleaning system; Levolor Electronic water fill system

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    New Caney, Texas
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    Re: Blue Granular Residue in Pool

    That looks like my daughters pool noodle only hers is orange. So I bought a new one.
    18' x 42" Intex (4786 Gal @ 80% capacity) Intex 8110 SWCG, 2000 GPH cartridge filter.
    Full Sun, Well Water, Borates at approx. 50
    TFTestKit-100--The Pool Calculator--Pool School

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    Butterfly's Avatar
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    Re: Blue Granular Residue in Pool

    Latest tests: FC/TC: 5+, pH 7.8, TA 150, CH 430, CYA 50, Salt 2800
    How did you get these test results?
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

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  11. Back To Top    #11

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    Re: Blue Granular Residue in Pool

    I used my Taylor test kit for the results.
    18,000 gallons - IG; Built: June, 2010
    Easytouch panel; Intellichlor IC40 ECG; Pentair cartridge filter: CCP 420
    Pebbletec (Tahoe Blue); Pump-Pentair Challenger, 346201, CHII-NI-2A, 2hp, 2" x2"
    Electric Cover (always closed when not using); Geothermal Heater
    Polaris UltraFlex2, in-pool cleaning system; Levolor Electronic water fill system

  12. Back To Top    #12

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    Re: Blue Granular Residue in Pool

    Could it be some of your Pebbletec? The color looks like the picture of Tahoe Blue Pebbletec that I pulled up.
    24,000 gallon in-ground plaster, Pentair FNSP60 60 sq. ft. DE filter @ 9,000 GPH, 2HP WhisperFlo pump, CircuPool RJ45 SWG, 399k BTU Raypak heater, built 2008. Taylor K2006C kit.

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    Re: Blue Granular Residue in Pool

    Maybe. I don't know why that would be happening now though. The pool is 2 yrs old. Also, it doesn't seem like any other colors of the Pebbletec are showing up in the strainer.
    18,000 gallons - IG; Built: June, 2010
    Easytouch panel; Intellichlor IC40 ECG; Pentair cartridge filter: CCP 420
    Pebbletec (Tahoe Blue); Pump-Pentair Challenger, 346201, CHII-NI-2A, 2hp, 2" x2"
    Electric Cover (always closed when not using); Geothermal Heater
    Polaris UltraFlex2, in-pool cleaning system; Levolor Electronic water fill system

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