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Thread: Back from vacation with a green pool!

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    victoria4504's Avatar
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    Back from vacation with a green pool!

    Returned from a week's vacation yesterday and found green water in the pool and was too tired to do much more than pour a bottle of bleach in the pool. This morning I tested the pool water and got these results:

    FC: 8.5
    CC: 0
    TC: 8.5
    pH: 7.8
    TA: 80
    CH: 130
    CYA: 30

    The first thing I did was go to the Pool Calculator and found out how much bleach to add to bring the FC level up to shock. I added 112 oz. of bleach. THEN I read that I should have taken care of the high pH first.

    What should I do now? Should I lower the pH and then continue shocking the pool or should I continue shocking the pool until the algae is gone and not worry about the pH at this time?

    Please help and thank you!
    8,300 gallon AG printed vinyl pool, Lomart Spectra 4 w/6 Position Valve 17" Sand Filter, Magnetek HP 1.0 SPL (60 GPM) Pump, Baltimore, MD

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    keri1973's Avatar
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    Re: Back from vacation with a green pool!

    What did you do to prepare your pool before you left?
    18ft. Arcadia Round AGP - 19" Sand Filter, 1 hp pump
    Foam cove/ Gorilla Pad/ Wedding cake steps
    Sta Rite Lil' Shark cleaner and Aquabot Pool Rover cleaner - Aqua-Luminator light and return flow w/fountain attachment
    Added Borates 5/19/09 Taylor K-1005 and Taylor FAS-DPD Chlorine Tests

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    frustratedpoolmom's Avatar
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    Re: Back from vacation with a green pool!

    7.8 is high but acceptable - but this was the level before you shocked, right? I'd just wait til the FC drops back down below 10 and then adjust the PH down to 7.5 ish.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    victoria4504's Avatar
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    Re: Back from vacation with a green pool!

    Okay, I shocked the pool water at 10:00 a.m. with enough bleach to put the FC level at 15. I checked the FC level again at 1:30 p.m. and the FC is down to 9.5. So I should now try to adjust the pH level to around 7.5 ish and then continue to shock the water until the green disappears and the overnite FC test remains stable?

    Also, what do you think the best product is to lower the pH? In the past I used Lo n' Slo. Using muriatic acid sounds somewhat hazardous. What do most folks use?

    Thanks again!

    Vicky
    8,300 gallon AG printed vinyl pool, Lomart Spectra 4 w/6 Position Valve 17" Sand Filter, Magnetek HP 1.0 SPL (60 GPM) Pump, Baltimore, MD

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    reebok's Avatar
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    Re: Back from vacation with a green pool!

    you can lower it. most people use muriatic acid. don't breathe the fumes or shower in it and you should be ok. it is pretty heavy duty stuff. they do make dry acid which I suppose is that product you mentioned. I would immediately raise your fc back to shock level. you can adjust the ph anytime now that you know what it is for sure. maybe add about 2/3 the recommended amount since your ph isn't even out of range really, to avoid dropping it too low since you won't be able to test.
    16x32 21,000 gallon in-ground exposed aggregate, 1.5hp pump, 120 sqft catridge filter, birdcage, solar panels, aquavac tigershark qc robot.

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    Mod Squad Bama Rambler's Avatar
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    Re: Back from vacation with a green pool!

    Muratic Acid really isn't that hazardous but if you'd prefer you can use pH down (dry acid). It contains Sodium Bisulfate.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    victoria4504's Avatar
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    Re: Back from vacation with a green pool!

    I'm confused now. All day yesterday (5 times), I checked my FC levels and added bleach to keep the water at shock level. I brushed the pool twice, cleaned off some black looking stuff from my return flap, backwashed the filter twice, added about 2 inches of water, and took the steps (which were a little green) out of the pool and cleaned them.

    The last FC reading I took at 11:30 last night was 11 so I added 70 oz. of bleach. I just tested the water today at 11:30 am and my FC level was 11.5?????

    But my water is still green!! I am now going to test everything again...be right back!

    Okay, here's the numbers:

    FC: 11
    CC: 0
    TC: 11
    pH: 7.8
    TA: 90
    CH: 130
    CYA: 50

    Since yesterday morning's readings:

    TA changed from 80 to 90
    CYA changed from 30 to 50

    Help, what is happening and what should I do?

    Thanks, Vicky
    8,300 gallon AG printed vinyl pool, Lomart Spectra 4 w/6 Position Valve 17" Sand Filter, Magnetek HP 1.0 SPL (60 GPM) Pump, Baltimore, MD

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    duraleigh's Avatar
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    Re: Back from vacation with a green pool!

    Help, what is happening and what should I do?
    The chlorine is being consumed by the algae in your pool. While killing algae, chlorine is likewise consumed.

    You must keep replenishing the chlorine back up to shock level (as often as practicable) until your pool is crystal clear. This may take several days.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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