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Thread: Green Algae

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    Green Algae

    Hello All,

    I need some help and I think I know the answer based on other readings but wanted to ask. I am seeing little bits of green algae in the pool and it is cloudy. Here are my readings as I tried to shock it but I don't think I am getting at high enough levels.

    FC=25
    CC=0
    TC=25
    TA=120
    PH=7.5
    CYA=100

    Any help anyone anyone can help with would be great.

    Thanks,
    Jeff
    18x36 IG - 23,500 gallons, vinyl liner, waterco s600 sand filter, 1 HP pump. TF-100 Testing Kit

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    Mod Squad YippeeSkippy's Avatar
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    Re: Green Algae

    Adding something called "Shock" is like spittin' in the wind. Its just not going to last but hours in which time the algae will have eaten it all up! What you need to do is perform a SLAM procedure. That is where you raise your FC level up to an appropriate level based on your CYA stabilizer level, and then maintain it at the high level until the pool is clear.

    Pool School - SLAM - Shock Level And Maintain

    Which test kit are you using and how sure of those numbers are you? Your CYA is seriously high, in fact may be higher than you think cause the test doesn't read higher than 100......to figure out how high it truly is: take equal parts of tap water and pool water and mix. Then use this mixed water as your pool sample water and do the CYA test again but doubling the results. If it truly is this high, you may have to resign yourself to draining some water out and replacing it with CYA-free water.

    Any questions??
    My Amazon Smile for November12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
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    Patrick_B's Avatar
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    Re: Green Algae

    Yes, the key is to get it to the proper high level and hold it there, without letting it slip below the target value as outlined by the SLAM procedure. As soon as it does, the Algae makes a comeback.
    TFP Moderator
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    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

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    Re: Green Algae

    Thanks for the help. I did the test per your request with the tap water and I got 50 so doubled would be 100. I am using the TF-100 testing kit. Per the SLAM information I need to get the CF level to 39. Are there issues with that or do I just proceed? I do have another question - how come I am not seeing anything with my CC levels? I figured with the little bit of algae in the pool I would see something at the CC level.

    Jeff
    18x36 IG - 23,500 gallons, vinyl liner, waterco s600 sand filter, 1 HP pump. TF-100 Testing Kit

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    Mod Squad kimkats's Avatar
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    Re: Green Algae

    HI! Great job getting the good test kit! You just thought your pool was clear before! Wait until you see how clear we can help you get it!

    CC---weird huh but it happens a lot. That is why CC is only ONE of 3 "tests" to see if pool is "clear".

    CC less than .5
    Overnight loss of less than 1ppm FC
    Clear water and no stuff on the bottom.

    Here is a link to the overnight test.
    Pool School - Perform the Overnight FC Loss Test (OCLT)

    With your CYA being so high you would be better off draining some of your water. At FC of 39 is going to take a LOT of bleach to get and keep it there all of the time until your SLAM is done.

    Here is a link to a neat tool to help you figure out how much water to drain to get your CYA down to 30.

    http://www.troublefreepool.com/calc.html

    Let us know if you have ANY other questions.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: Green Algae

    I tested the water again this morning and my FC was the same as last night 25. Any thoughts?
    18x36 IG - 23,500 gallons, vinyl liner, waterco s600 sand filter, 1 HP pump. TF-100 Testing Kit

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    Re: Green Algae

    Yes. You need to raise it to 39. Keep at it. Your doing great!
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

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    Re: Green Algae

    SLAMming the pool with 100 CYA is very troublesome and at the end you still end up with a CYA of 100,,,,,not good. If it were my pool I would drain 50% of the water right now and refill to get the CYA to 50 ppm. OP will still have enough FC in the pool to hold SLAM value as it drains.

    Once refilled, the SLAM value will then be around 24 and OP will have better luck at that level.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Green Algae

    I am new to this and just concerned about pulling that much water out of my pool and refilling.....Any issues with the liner or anything like that?
    18x36 IG - 23,500 gallons, vinyl liner, waterco s600 sand filter, 1 HP pump. TF-100 Testing Kit

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    Mod Squad YippeeSkippy's Avatar
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    Re: Green Algae

    You can drain just that much....never leave less than a foot of water in the shallow end to protect the liner from moving.
    My Amazon Smile for November12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
    Our pool build--> Our Pool Solved Our Sloping Yard Skippy's Cheap Pool Cooler -->Skippy's New Fountain

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    Re: Green Algae

    Thanks everyone for the help. I will keep everyone updated as I move forward. Looking forward to getting the pool back to being crystal clear.

    Jeff
    18x36 IG - 23,500 gallons, vinyl liner, waterco s600 sand filter, 1 HP pump. TF-100 Testing Kit

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