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Thread: Battling a green pool, low FC

  1. Back To Top    #1

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    Battling a green pool, low FC

    I am a first timer on this forum and i've already read plenty of great tips!


    I'm looking for some help with the following problem. I opened my pool 2 days ago and it's still very green. I have a 32,000 gal gunite pool that's probably 25 years old with a sand filter. I've added 1 gal of algecide, 4 gal of liquid super shock. I've brushed, brushed, vacuumed, vac some more, backwashed and rinsed a bunch of times, vac some more, etc.


    Last year, we had a similar problem and the pool company recommended a bunch of chemicals that changed our green problem to a cloudy/misty problem that lasted for half the summer!


    I tested the water tonight and here are the ugly #'s:



    CYA: 67
    TC: 8.5
    FC: 0.2
    ph: 7.4
    TA: 120
    Hardness: 156


    The pool store said they want to do a more complete chlorine test tomorrow that will take an hour or so to get the results. As you can probably tell, i am a novice in need of some guidance. Any help would be greatly appreciated.


    Thanks,

    Jim
    Jim


    32K Gunite Pool
    Attached Spa
    1.5 HP Hayward Super Pump
    Hayward Pro Series 224 Sand Filter

  2. Back To Top    #2
    JasonLion's Avatar
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    Welcome to TFP!

    You are going to need a lot of chlorine. I suspect they are planning to try and figure out just how much.

    I suggest you start by reading this article on cleaning up a green pool.

    It would be a huge help if you had your own test kit, especially a top quality test kit that can reliably measure high FC levels. I recommend the TF Test Kit.

    You are also going to need to stock up on chlorine. Normally I recommend bleach, but you need to get your calcium level up so it might be better to use cal-hypo for a little while.
    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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    Hey, Jim,

    Welcome! Take Jason literally....you'll need a LOT of chlorine.....LOT"S of it!!

    You can get that pool crystal clear with help from this forum but the pool store will most likely argue with the techniques we'll suggest. Before too long, you'll have to make a decision which path to follow but I can promise the path from the forum does work and you'll spend a lot less money....no cloudy water, either.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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  4. Back To Top    #4

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    Thanks for the scoop.

    I am willing to give the triple B a go!!! I've been following the pool store blindly for a while without good results.

    The assault on my grocery stores' bleach supply will begin tomorrow!

    As Jason recommended, i will also try the cal-hypo to start things off.
    Jim


    32K Gunite Pool
    Attached Spa
    1.5 HP Hayward Super Pump
    Hayward Pro Series 224 Sand Filter

  5. Back To Top    #5

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    Well, i heard back from the pool company today and they recommended buying either 42 pounds of CLC II or 42 pds of burnout.

    I also purchased a TF test kit online today, so the only numbers I have are from the pool store. The latest test results are at the beginning of the thread.

    Jason recommended cal-hypo-i'm not sure what that is.

    Does anyone have any idea if one of these products is the way to go? I have a couple of gallons of liquid super shock left and I am tempted to use them first.

    Any ideas???
    Jim


    32K Gunite Pool
    Attached Spa
    1.5 HP Hayward Super Pump
    Hayward Pro Series 224 Sand Filter

  6. Back To Top    #6

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    Jimstinger5,

    Does anyone have any idea if one of these products is the way to go? I have a couple of gallons of liquid super shock left and I am tempted to use them first.
    Chlorine is the way to go. You MIGHT be able to use the "liquid super shock" that you have, but you should read the label and post back here what the label says. Then we'll be able to advise you whether you should add this to your pool.

    In general, you should KNOW exactly what chemical you are putting into your pool. In general, you should avoid "combo" packages of chemicals. Adding a single chemical at a time, and KNOWING why you are adding that chemical, is the approach preferred by this message board.

    Good luck!

    Titanium
    24,000 gallon inground freeform pool/spa circa 1983 (113 ft perimeter, 625 sq ft) with 350 gallon attached spill-over spa
    2007 2 HP, three-phase Hayward TriStar pump which is powered by an Ikeric VS-200 variable speed drive system
    1983 Laars XE Pool/Spa Heater Type ES 400,000 BTU, 1998 Hayward Super Star-Clear C-4000 cartridge filter (400 sq ft, 4 separate cartridges)
    1998 Polaris 380 pressure-side cleaner w/ 3/4 HP booster pump
    One skimmer :( and one PoolSkim :), One Supervision Galaxy LED pool lamp, Second story solar panels
    Hayward/GoldLine AquaLogic PS4 (replaced 1983 vintage dual circuit Intermatic timer)

  7. Back To Top    #7
    Quote Originally Posted by Jimstinger5
    Jason recommended cal-hypo-i'm not sure what that is.
    Calcium Hypochlorite
    That would be the powdered "shock" (the kind with chlorine, check the ingredients) they sell at pool stores

    Bleach and the liquid kind they sell is Sodium Hypochlorite
    18X36 IG vinyl 22100 gal. 1.0 HP Hayward Pump w/300# Hayward sand filter.

  8. Back To Top    #8

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    New to this site too so I don't know much but....... my husband was adding algaecide, shock and anything else they sold us like it was sugar in sweet tea. Our CYA level was 170 when I came to this site for help. (We had been battling each other and black alage for months.) We replaced 2/3 of our water to get the CYA back down to 70. I think the CYA came from all the "Instant Cures" we dumped into the pool. My pool in now sparkling clean from following their advice. It did take longer than I thought it would, but it was worth the wait. It is so clear and clean
    Built in 95, 35,000
    3 Hayward Super II, NaviGator (retired),Baracuda. Dolphin Diagnostic cleaner
    1/2 the water changed 5/4/8, 2/3rds changed 5/17/08

  9. Back To Top    #9
    JasonLion's Avatar
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    Burn Out Extreme is cal-hypo, calcium hypochlorite. The liquid shock is bleach, though the percentage may well be higher than the usual 6% you find at the grocery store, or not. You might want to compare prices on the cal-hypo. Leslie's has a 50 lb bucket of 73% for an attractive price.

    Given the quantities that are likely to be involved, it would be good to do a bucket test to double check the pool store estimate. That means getting a five gallon bucket of pool water, add one teaspoon of 6% bleach, mix, wait 30 minutes, and test the FC level. Repeat this process until the FC level is 10 or higher. From the number of teaspoons of bleach required we can get an estimate of the amount of chlorine you will need. This may be what the pool store did, but you never know.
    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

  10. Back To Top    #10

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    Thanks for the advice, the burn-out got rid of my green color overnight. I'm looking at a nice blue misty color now- much better than the green i've had!

    My TF test kit just arrived and my first numbers are:

    CYA: 70
    TC: 8.5
    FC: 6.1
    TA: 61
    ph: 6.7
    Hardness: 151

    Being a new convert to the BBB method, my question is which level should I address first? The pool calculator advises putting quite a bit of borax and baking soda into the pool. My pool company recommended 8 gallons of liquid shock(12.5%).

    Does anyone have any ideas about which reading to work on first? Is shock the way to go?
    Jim


    32K Gunite Pool
    Attached Spa
    1.5 HP Hayward Super Pump
    Hayward Pro Series 224 Sand Filter

  11. Back To Top    #11

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    Sorry- i just added my pool dimensions on my signature...

    Jim
    Jim


    32K Gunite Pool
    Attached Spa
    1.5 HP Hayward Super Pump
    Hayward Pro Series 224 Sand Filter

  12. Back To Top    #12

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    In the following order I would....

    1. Use 20 mule team borax to increase the pH up to 7.2 (Use Jason's calc in my sig if you haven't already)
    (you can do #2 immediately after #1)
    2. Using either Cal Hypo or Clorox or liquid chlorine, I would bring the FC up to 25ppm and HOLD IT THERE.

    The process is complete when:
    A. You hold FC loss to 1.0 or less overnite
    B. Your CC's test .5 or less
    C. Your water is sparkling

    Jim your CYA is very high for a non-SWG pool but it is manageable......just don't use any chlorine source that would make it higher (pucks and di-chlor). The high levels of FC will rid your pool of the CC's and clear your pool water to sparkling....promise.

    Tell us how your water looks right now?
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  13. Back To Top    #13

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    The water is not that bad- it is slightly misty. I can see about 3 steps down. The green is completely gone.

    Is sodium hypoclorite the same as the liquid bleach you mentioned? I do have plenty of that (in the form of super shock 12.5) and I have regular chlorox bleach(6% i think).

    I'm off to clean out my local store of 20 mule team!!!
    Jim


    32K Gunite Pool
    Attached Spa
    1.5 HP Hayward Super Pump
    Hayward Pro Series 224 Sand Filter

  14. Back To Top    #14

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    I'm off to clean out my local store of 20 mule team!!!
    Yikes!! Someone grab his car keys!!

    Jim, It'll probably only take a couple of boxes...(use Jason's calc in my sig.)

    Yes, Sodium Hypochlorite is liquid chlorine or bleach....all the same.

    Sounds to me like you're getting close to a clear pool. I was somewhat skeptical you would take the BBB plunge in my first post to you but you have gotten a good grasp and embraced the concept......Very nice work...you have a sparkling pool in your future.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  15. Back To Top    #15

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    One other quick question- how do i know what the ideal chemical levels are? This would vary the amount of everything i put into the pool. Is there a website to refer to or are the chem levels pretty standard?
    Jim


    32K Gunite Pool
    Attached Spa
    1.5 HP Hayward Super Pump
    Hayward Pro Series 224 Sand Filter

  16. Back To Top    #16

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    this link lists the recommended levels

    http://www.troublefreepools.com/sticky.php?s=4953
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  17. Back To Top    #17
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    POST PICS!!!

    We want to see your pool! 8)
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  18. Back To Top    #18

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    Just put the borax and liquid shock in, but this is a big improvement from a couple of days ago!!!
    Attached Images Attached Images
    Jim


    32K Gunite Pool
    Attached Spa
    1.5 HP Hayward Super Pump
    Hayward Pro Series 224 Sand Filter

  19. Back To Top    #19

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    The BBB method seems to be working. I just tested the water and the new numbers are encouraging. My pool has lost any trace of green, but now the water is cloudy. I can see about 3 feet into the pool before it clouds over.

    Any suggestions on my next move?

    My water results were:

    TA: 130
    ph: 7.5
    TC: 9.5
    FC: 8.5
    CC: 1.0
    CH: 170
    CYA: 30
    Jim


    32K Gunite Pool
    Attached Spa
    1.5 HP Hayward Super Pump
    Hayward Pro Series 224 Sand Filter

  20. Back To Top    #20
    JasonLion's Avatar
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    You still have CC above 0.5, so I would maintain shock level, FC at 13 or higher, for at least another day and then see where you are.

    Once the algae is all dead it can still take up to a week for the filter to clear the pool. Keep an eye on the filter pressure and clean/backwash the filter as needed.
    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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