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Thread: Green water, broken filter, big party scheduled, what to do?

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    Green water, broken filter, big party scheduled, what to do?

    Here we go.

    I have a 45000gal in ground SWG vinyl lined pool.
    Followed the BBB methods and have had spectacular water.
    Went away for long weekend.
    Upon return water level was several inches low.
    Refilled with well water(first time using well to fill pool) while kids swam.
    Wife came home from work and wanted to go for a dip, said water was green and too cold. Please turn pump and heater on.
    I turned the pump on and found the source of my low water. The body of sand filter was cracked and produced a geyser.

    Pool store ordered new filter under warranty, be here in a week. Need to shock pool.

    Over a period of 4 days I shocked the pool, first up to 24ppm for two days, then up to 36ppm for two days. No change noticed. My pump will recirculate and I have an endless pool so I have good mixing.

    Pool store said to use flocking liquid then vacuum to waste. No change noticed. No precipitate to vacuum.

    Took water sample to second pool store, tests show no iron or copper, but ph up to 8.4. I added 2.5 gal muriatic acid.
    Now waiting to re-test ph.

    I surmise that something in the well water has caused my pool water to turn green. Water is clear and colorless to about 3 feet in depth, below 3 feet it gradually turns green, but still clear.

    Whatever it is that is coloring my water should not be organic because, my chlorine levels have held very well and there has been little precipitate filtered with my robot.

    So, any ideas what this is, and can it be eliminated without the use of my sand filter? Naturally, the new filter will not be online before my sons Marching Band party on Thursday, 8/13/09.

    Thanks in advance for your help!

    Edited for more natural font size. JasonLion
    kbpool
    AG,vinyl
    13500
    cartridge filter

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    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    Re: Green water, broken filter, big party scheduled, what to do?

    Welcome to TFP!

    We need a full set of water test results before we can tell you how to solve the problem. Also, when you say the water is green, is that a cloudy/murky green or a clear sparkly transparent green?

    If the water is currently cloudy and the filter isn't working, the only way to clear up the water is with floc and vacuuming to waste (which is a pain and doesn't always work). And that is assuming that any algae is in fact dead.
    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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    Mod Squad JohnT's Avatar
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    Re: Green water, broken filter, big party scheduled, what to do?

    Quote Originally Posted by collgirl
    Took water sample to second pool store, tests show no iron or copper, but ph up to 8.4. I added 2.5 gal muriatic acid.
    Now waiting to re-test ph.

    Your high chlorine level is interfering with the pH test. Don't adjust it until you have a normal chlorine level.
    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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    MikeInTN's Avatar
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    Re: Green water, broken filter, big party scheduled, what to do?

    Took water sample to second pool store, tests show no iron or copper, but ph up to 8.4. I added 2.5 gal muriatic acid.

    I surmise that something in the well water has caused my pool water to turn green. Water is clear and colorless to about 3 feet in depth, below 3 feet it gradually turns green, but still clear.
    Hmmmm..can you take a sample of your well water and have that tested? Or get a second opinion at another pool store? This sounds like a classic case of iron in the water. The iron will cause the water to turn yellow, and against a blue background (like your liner) looks green.
    24' x 52" AGP - approx 13,500 gallons
    Pentair Optiflo 1 hp/2sp pump w/ Swimpro Voyager 150 sq ft cartridge filter
    Intex 8110 SWCG
    "Fear the Schnauz!"

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    Re: Green water, broken filter, big party scheduled, what to do?

    Hey guys,

    Thanks for your prompt replies! I went back to the second pool store and had them retest my water. They also gave me an adapter for one of my returns and suggested that I zip tie an old t-shirt to it just to see what it might collect. They said to block one of my three returns off, use t-shirt filter on the second and leave the third alone.

    Test Results
    Sat. index 0.4
    TDS 500
    CYA 0
    Tot CL 10
    FC 9.8
    pH 8.3
    Tot alk 68
    Adj Tot alk 68
    Tot Hardness 121
    salt 3400
    Borates 54
    Copper 0
    Iron 0
    Manganese none
    Cloudy no
    Staining no

    pH strip at store tested low, and home test reads 7.2. CYA tests 60 at home. FC tests 24 with drop test.

    Water is still clear and green.

    Hope this info helps.

    Thank you
    kbpool
    AG,vinyl
    13500
    cartridge filter

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    Join Date
    Feb 2009
    Location
    West Virginia
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    Re: Green water, broken filter, big party scheduled, what to do?

    Before we found BBB, and before we added a water softener system to take care of our hard well water, we had this same issue every time we added water to our pool. It would turn a shade of green (but not algae) by the next day after the top off. PB said it was because of the iron in our water. We had to add a product called Metal Out every time we topped off. Don't know what was in it exactly because we didnt know to look at label back then, but it worked.
    WV Girl

    Custom "L" shape IG gunite pool, 36K gal., main drain, 2 skimmers, 3 returns, hayward heat pump, hayward 1.5hp pump with booster pump, ozonator, 4 cartridge filter.
    one dear hubby, two waterlogged kids, and lots of good times!

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    JasonLion's Avatar
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    Re: Green water, broken filter, big party scheduled, what to do?

    Assume the test results are right, your first priority is to get the PH down to around 7.5. It is important to keep PH below 8.0 if at all possible and ideally between 7.5 and 7.8.

    You also should add some CYA to around 30 to 40. Without any CYA in the water you will lose all of your chlorine very quickly any time the sun is out.

    The green is most likely from metals in the water, combined with high FC, high PH, and low CYA. Adding CYA and lowering the PH will very likely get rid of the color. If that isn't enough you will need to use some sequestrant.
    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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