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Thread: New Pool Turned Green Overnight

  1. #1
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    New Pool Turned Green Overnight

    Hi,
    New member here. Our pool was plastered with River Rok June 8th and filled by June 10th. Pool tech came out on June 11th to do pool school, and added startup chemicals. They gave me 4 weeks supply of chemicals, to be added each Thursday. Yesterday was our first day, and we added the following:

    3 bags Blue Water Crystals
    1/2 bottle Algaecide
    4 chlorine pucks in each of 2 skimmer baskets
    2 gallons muriatic acid

    We had lots of rain yesterday/last night, and woke up to a green pool - clear, not cloudy, but definitely green. Do not have a test kit yet. We live in central NJ.

    Any ideas?
    36K inground, Hayward 450SF Cartridge Filter, Hayward 2HP Pump, River Rok Granite Pebble Finish, soon to be SWG

  2. #2
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    Re: New Pool Turned Green Overnight

    That's alot of acid
    Was the pump running overnight?

  3. #3
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    Re: New Pool Turned Green Overnight

    The pump has been running 24/7 since last Thursday.
    36K inground, Hayward 450SF Cartridge Filter, Hayward 2HP Pump, River Rok Granite Pebble Finish, soon to be SWG

  4. #4
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    Re: New Pool Turned Green Overnight

    Without testing there's no way to know exactly what's going on with your water.

    With brand-new plaster the pH will rise very quickly for several weeks, and will tend to rise more than usual for up to a year. Lots of acid is not unusual in the early days of a plaster pool. But you won't know when or how much to add acid if you don't test!
    --paulr
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

  5. #5
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    Re: New Pool Turned Green Overnight

    Husband took water sample to local pool store for testing. Will let you know results as soon as I get them...
    36K inground, Hayward 450SF Cartridge Filter, Hayward 2HP Pump, River Rok Granite Pebble Finish, soon to be SWG

  6. #6
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    Re: New Pool Turned Green Overnight

    Get your own test kit... in the long run it will save you. In the short run it might save you too, because new plaster pools really do have serious pH management issues. If you can do your own test every day you'll be able to keep on top of things and not have to keep running out to the pool store.

    Around here we really like the Taylor K-2006, also sold by Leslie's as the FAS-DPD Service Kit (but probably not stocked by the store), and the TF100 from tftestkits.net (which is what I have). These kits have all the tests you really need, including the FAS-DPD chlorine test (can't shock properly without it) and the CYA test.
    --paulr
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

  7. #7
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    Re: New Pool Turned Green Overnight

    What is the active ingredient of the algaecide?

    What brand are the pucks, and do you have anything that lists the active ingredient?

    Some of these products -some brands - they contain copper, and copper can give the water a funny color. I doubt that is what this is, but it's good to rule it out.

    I second the advise for your own test kit. It's the best investment you can make to protect your investment.
    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

  8. #8
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    Re: New Pool Turned Green Overnight

    Here are the numbers:
    TC - 6.7
    FC - 6.7
    PH - 6.4
    Total Alkalinity - 40
    Calcium - 300
    Stabilizer - 100
    36K inground, Hayward 450SF Cartridge Filter, Hayward 2HP Pump, River Rok Granite Pebble Finish, soon to be SWG

  9. #9
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    Re: New Pool Turned Green Overnight

    I don't necessarily trust these numbers, but if they are accurate, your PH is too low and so is your TA. I think you maybe overdoing it a bit on the acid additions....with your own test kit you can test and dose accurately and avoid dramatic fluctuations.

    Also your CYA is a little high too, for operating an SWG you don't want it above 80.

    You really need your own kit to determine if these are accurate.

    If this is algae starting, you'll need to shock your pool. That's gonna be kind of hard without your own kit and having CYA at 100.
    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

  10. #10
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    Re: New Pool Turned Green Overnight

    Hi hawkfive,

    I suggest you contact your PB about your green water and the test results. Depending on their start-up procedure, you don't want to do anything to mess up your warranty.

    Yes, the best investment you can make in your pool is a good test kit. My fav is the TF100 from TFTestKits.net.

    See our Start up New Plaster article in Pool School for some info that might help.

    Welcome to the forum
    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.

    ~ One should not use a sledge hammer to swat a mosquito. ~

    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  11. #11
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    Re: New Pool Turned Green Overnight

    Ok, spoke to the pool service co that my PB contracted with, and read her the test results that we got from a local pool store. She believes we may have overchlorinated, given that it's really not been hot or sunny here this past week. She wants us to add 1/2 of a 25lb bag of alkalinity and see what happens in 3-4 hours. Does this sound right?
    36K inground, Hayward 450SF Cartridge Filter, Hayward 2HP Pump, River Rok Granite Pebble Finish, soon to be SWG

  12. #12
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    Re: New Pool Turned Green Overnight

    Overchlorinated? For your CYA of 100, minimum FC is 7, so you are already too low. You really want to target about 12 until you can get the SWG operating. "Overchlorinated" wouldn't affect low ph or TA readings, and it wouldn't make the pool turn green. Doesn't sound right to me.

    Do you have the alk up already - otherwise it's the same thing as Baking Soda, only Alk Up costs more. Sure add it, won't hurt, it'll raise the TA up slightly, won't do much for the PH but that should rise on it's own from the plaster curing, and it won't do anything for the green....
    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

  13. #13
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    Re: New Pool Turned Green Overnight

    We had lots of rain yesterday/last night, and woke up to a green pool - clear, not cloudy, but definitely green.
    Lot's of good advice above but please don't overlook what made your pool turn green....lack of chlorine.

    You need chlorine in your pool and you need to continually replenish it.......it's the only thing that will fight the algae (that's the green in your pool) and keep your water crystal clear if you maintain it (the chlorine) properly
    Dave S.
    Site Owner 42k vinyl and concrete pool, 1.5hp pump, 140gpm filter, No SWG
    TFTestkits owner
    TFTestkits , PoolMath , Pool School

  14. #14
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    Re: New Pool Turned Green Overnight

    It is difficult to comprehend how/why a pool that has been filled only nine days can have a CYa of 100.

    Can you take a water sample to another pool store for testing?

    This is the reason we recommend getting your own test kit instead of using the pool store for testing.
    Too much wrong info from pool store.
    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.

    ~ One should not use a sledge hammer to swat a mosquito. ~

    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  15. #15
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    Re: New Pool Turned Green Overnight

    I'm guessing the "pool tech" that did the startup June 11 added something to raise the CYA. Overshot things just a a tad...
    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

  16. #16
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    Re: New Pool Turned Green Overnight

    Good news! Was finally able to reach original tech on his cell. He believed it was metal in the water, and had us add 4 qts of Sequa-sol, a sequestering agent. Woke up this morning to a beautiful blue pool!
    36K inground, Hayward 450SF Cartridge Filter, Hayward 2HP Pump, River Rok Granite Pebble Finish, soon to be SWG

  17. #17
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    Re: New Pool Turned Green Overnight

    Quote Originally Posted by hawkfive
    Here are the numbers:
    TC - 6.7
    FC - 6.7
    PH - 6.4
    Total Alkalinity - 40
    Calcium - 300
    Stabilizer - 100
    That PH is definitely too low, so too much acid going in, even for the new plaster.

    Anyone know how did the stabilizer got to 100 in a week with tabs?

    Edit: Guess I should read the full thread before responding. Has been asked already.

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