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Thread: "Slime Green"

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    "Slime Green"

    First, let me introduce myself. I am Babe the Blue Ox from NE Oklahoma, and I am never going to the pool store again.

    I have a 30 ft. above ground pool, 23,800 gallons. I've been using pool store chemicals for the past 3 years and always have had good luck until....

    We took an 11 day vacation recently. Came home a week ago and found a slime green pool. Everything seemed ok test wise, but the algae was so thick that you couldn't see more than 6 inches down.

    I had the pool guy test the water and we found that the CYA had risen off the charts. I've removed and refilled half the water twice to get it down to an alleged 35 CYA. I then talked to 3 guys at the store, and each of them gave me a different solution, all of which involved a bottle, tub or vat of expensive gunk. I thanked them kindly and left, vowing to not return.

    I went straight to wal-mart and bought 6 big jugs of bleach, as I'm ready to become a BBB convert. However, the bleach does not seem to be working as the pool is still about the same shade of nasty.

    I picked up a 6-way test kit today and found that the CYA is close to 60 and that the pool store calculation was way off.

    I've been using the pool calculator to get my free chlorine level to 16, but now I find that it should really be 24.

    Here are my readings (from my own testing):

    Chlorine 16
    PH 7.5
    Alkalinity 100
    CYA 58

    I bought some more bleach and have added enough to raise chlorine to 24. I've brushed once per day according to the pool school guidelines. What's next?
    Thanks for reading... - Tony
    Da' Pool: Intex 15'x42" 3284gal AGP EasySet (Inflatable Ring) - (Summer 2014: 27' round EW /w 6.5' deep end @ 22,500gal)
    Pump & Cart Mod: 1000gph Cart. 5ft² - 2 nylons, 24/7 OP. Traps bugs/bits, lasts longer/cleans easier = Happier Pool Owner!!
    The Bible for a "Trouble Free Pool" life = PoolSchool, the BBB method a TF100 test kit(Recommend Kits Compared). - Cleaning a Sand Filter
    Water looks like GLASS, if yours doesn't...SLAM IT! Feels nice and never been happier!!! :D

  2. Back To Top    #2
    Vette's Avatar
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    Re: "Slime Green"

    You read pool school, correct? It sounds like you have a good plan of attack. need to wait it out and keep the filter on 24/7, backwashing when needed. That will clear up the dead algae. You need to hold at shock level until you pass the criteria listed in the "how to shock" in pool school.
    11,700 gallon 21' round 54" deep all-resin AGP - June 2012
    Waterway 1HP 2-speed pump / 100 sq ft cartridge filter
    Hayward 150,000btu Natural Gas heater
    I use and recommend the TF-100 for testing

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    Re: "Slime Green"

    You likely will need many, many, many more jugs of bleach. You now have to hold that FC @ 24ppm until your pool clears.

    Shock is a process and not a one time dose.

    read "The ABC's of Pool Water Chemistry" up in Pool School.

    read "How to Shock Your Pool" , and then follow those directions to an absolute T and your pool will clear.

    You will find it almost impossible to shock your pool properly without the use of a good test kit.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  4. Back To Top    #4

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    Re: "Slime Green"

    Thank you for the advice. My Free Chlorine has dropped from 24 to 20 over the past 3.5 hours. Should I add bleach now or would it be better to wait until dusk in order to counter the effects of sunlight on the pool?
    Thanks for reading... - Tony
    Da' Pool: Intex 15'x42" 3284gal AGP EasySet (Inflatable Ring) - (Summer 2014: 27' round EW /w 6.5' deep end @ 22,500gal)
    Pump & Cart Mod: 1000gph Cart. 5ft² - 2 nylons, 24/7 OP. Traps bugs/bits, lasts longer/cleans easier = Happier Pool Owner!!
    The Bible for a "Trouble Free Pool" life = PoolSchool, the BBB method a TF100 test kit(Recommend Kits Compared). - Cleaning a Sand Filter
    Water looks like GLASS, if yours doesn't...SLAM IT! Feels nice and never been happier!!! :D

  5. Back To Top    #5

    Re: "Slime Green"

    Aloha Babe the Blue Ox!

    It must already be evening in Oklahoma...so if you haven't added a bunch more chlorine, yes, it is time to add more! You are creating mono-chloramines, di-chloramines, and tri-chloramines in that pool as you destroy the algae...and you have to continue oxidizing those chloramines until they gas off (hopefully in tomorrows sunlight and breezes!).

    Then your Free Chlorine will hold better and things will return to "normal" (if there IS such a thing). But I wouldn't trust the test strip estimation of your CYA any more than I would trust the pool store's test of it. You really need to know the truth for yourself so you can determine "how much chlorine you need to keep in your pool" after this catastrophe clears up. And a good CYA test will also enable you to prevent the problem that caused this catastrophe:
    Not knowing your CYA level led to THINKING that you had enough chlorine in the pool to take a vacation.

    If you had known the TRUTH about your CYA, you could have poured in enough chlorine to have it dissipate slowly (due to the high CYA) throughout the vacation and returned to a decent pool with a normal amount of chlorine in it. Most of us (including ME!) have had to go through this problem before...then we got smart and used the knowledge about CYA and its relationship to chlorine.

    Aloha! Wish you the best!

    Warren
    Warren
    Big Island Pool Service

    No pool of my own...but my customers' pools are ALL my foster babies!!

  6. Back To Top    #6

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    Re: "Slime Green"

    Thanks for the welcome Big Island. I'm using drops, not strips to test my chems. I'm fairly confident that the CYA level is just shy of 60.

    The sun is setting right now, so I'll test FC again and then add enough bleach to get the level back up to 24.
    Thanks for reading... - Tony
    Da' Pool: Intex 15'x42" 3284gal AGP EasySet (Inflatable Ring) - (Summer 2014: 27' round EW /w 6.5' deep end @ 22,500gal)
    Pump & Cart Mod: 1000gph Cart. 5ft² - 2 nylons, 24/7 OP. Traps bugs/bits, lasts longer/cleans easier = Happier Pool Owner!!
    The Bible for a "Trouble Free Pool" life = PoolSchool, the BBB method a TF100 test kit(Recommend Kits Compared). - Cleaning a Sand Filter
    Water looks like GLASS, if yours doesn't...SLAM IT! Feels nice and never been happier!!! :D

  7. Back To Top    #7

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    Re: "Slime Green"

    The sun is setting right now, so I'll test FC again and then add enough bleach to get the level back up to 24.
    Excellent! (as Mr Burns would say) Check it again in the AM and bring it back to 24 in the AM. Sounds loike you've got the idea!!
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  8. Back To Top    #8

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    Re: "Slime Green"

    FC down to 15 this morning. Added enough bleach to bump it back up to 24. It may be wishful thinking, but it may look just a little better today.
    Thanks for reading... - Tony
    Da' Pool: Intex 15'x42" 3284gal AGP EasySet (Inflatable Ring) - (Summer 2014: 27' round EW /w 6.5' deep end @ 22,500gal)
    Pump & Cart Mod: 1000gph Cart. 5ft² - 2 nylons, 24/7 OP. Traps bugs/bits, lasts longer/cleans easier = Happier Pool Owner!!
    The Bible for a "Trouble Free Pool" life = PoolSchool, the BBB method a TF100 test kit(Recommend Kits Compared). - Cleaning a Sand Filter
    Water looks like GLASS, if yours doesn't...SLAM IT! Feels nice and never been happier!!! :D

  9. Back To Top    #9
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    Re: "Slime Green"

    How are you able to test FC over 5ppm? HTH 6 way kit doesn't test that high.
    Where kids swim in 54 degree water, turn blue, and giggle happily cuz they got a POOL!
    Year 3 BBB -15' x 48" Intex Metal Frame - Was using (2) 1000gph Intex cartridge filters (see Full time pumping Intex). 2012, converted to 1600gph and sand filter+SWG = Sand filter love affair!
    Don't waste time and energy looking for a better value on test kits, the TF100 is the best deal around. I did the looking and spent the extra money, but you don't have to make the same mistake. Just go here: TFTestkits. I use Pool Calculator for min/max, and shocking chlorine levels.

  10. Back To Top    #10

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    Re: "Slime Green"

    Quote Originally Posted by frogabog
    How are you able to test FC over 5ppm? HTH 6 way kit doesn't test that high.
    Diluting pool water with distilled water and multiplying the results. I read about this method somewhere on this forum.
    Thanks for reading... - Tony
    Da' Pool: Intex 15'x42" 3284gal AGP EasySet (Inflatable Ring) - (Summer 2014: 27' round EW /w 6.5' deep end @ 22,500gal)
    Pump & Cart Mod: 1000gph Cart. 5ft² - 2 nylons, 24/7 OP. Traps bugs/bits, lasts longer/cleans easier = Happier Pool Owner!!
    The Bible for a "Trouble Free Pool" life = PoolSchool, the BBB method a TF100 test kit(Recommend Kits Compared). - Cleaning a Sand Filter
    Water looks like GLASS, if yours doesn't...SLAM IT! Feels nice and never been happier!!! :D

  11. Back To Top    #11
    frogabog's Avatar
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    Re: "Slime Green"

    OK, but watch out. The higher the dilution the less accurate the results. I hope this isn't considered a long term solution, you do really need a FAS-DPD test to do this properly.

    Additionally, the key is to never fall below shock level. If that means adding more chlorine than will take to get to shock level, do it. Your pool and equipment is safe up to mustard algae shock level. If it's going to be a while before you can test and add bleach, guestimate what you might lose in that time and add that much more bleach.

    falling below shock level is what gorks the shocking process. It will go much smoother and faster if you can maintain it to never fall below.
    Where kids swim in 54 degree water, turn blue, and giggle happily cuz they got a POOL!
    Year 3 BBB -15' x 48" Intex Metal Frame - Was using (2) 1000gph Intex cartridge filters (see Full time pumping Intex). 2012, converted to 1600gph and sand filter+SWG = Sand filter love affair!
    Don't waste time and energy looking for a better value on test kits, the TF100 is the best deal around. I did the looking and spent the extra money, but you don't have to make the same mistake. Just go here: TFTestkits. I use Pool Calculator for min/max, and shocking chlorine levels.

  12. Back To Top    #12

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    Re: "Slime Green"

    No, this is a temporary solution. A proper test kit is on order and should arrive in a few days. I'm just using the dilution method until it shows up.
    Thanks for reading... - Tony
    Da' Pool: Intex 15'x42" 3284gal AGP EasySet (Inflatable Ring) - (Summer 2014: 27' round EW /w 6.5' deep end @ 22,500gal)
    Pump & Cart Mod: 1000gph Cart. 5ft² - 2 nylons, 24/7 OP. Traps bugs/bits, lasts longer/cleans easier = Happier Pool Owner!!
    The Bible for a "Trouble Free Pool" life = PoolSchool, the BBB method a TF100 test kit(Recommend Kits Compared). - Cleaning a Sand Filter
    Water looks like GLASS, if yours doesn't...SLAM IT! Feels nice and never been happier!!! :D

  13. Back To Top    #13

    Re: "Slime Green"

    Quote Originally Posted by BigIslandPoolService
    Aloha Babe the Blue Ox!

    It must already be evening in Oklahoma...so if you haven't added a bunch more chlorine, yes, it is time to add more! You are creating mono-chloramines, di-chloramines, and tri-chloramines in that pool as you destroy the algae...and you have to continue oxidizing those chloramines until they gas off (hopefully in tomorrows sunlight and breezes!).

    Then your Free Chlorine will hold better and things will return to "normal" (if there IS such a thing). But I wouldn't trust the test strip estimation of your CYA any more than I would trust the pool store's test of it. You really need to know the truth for yourself so you can determine "how much chlorine you need to keep in your pool" after this catastrophe clears up. And a good CYA test will also enable you to prevent the problem that caused this catastrophe:
    Not knowing your CYA level led to THINKING that you had enough chlorine in the pool to take a vacation.

    If you had known the TRUTH about your CYA, you could have poured in enough chlorine to have it dissipate slowly (due to the high CYA) throughout the vacation and returned to a decent pool with a normal amount of chlorine in it. Most of us (including ME!) have had to go through this problem before...then we got smart and used the knowledge about CYA and its relationship to chlorine.

    Aloha! Wish you the best!

    Warren
    Warren, I used to live in Hilo on Hawai'i. Loved it! Still have friends there. Are you Hilo or Kona (or Kohala) side?

    OP: you're on the right track, listen to these experts, and soon you'll be annoyed with the BBB method for showing you every speck of debris in your pool.
    16x30 20,600 gal Inground Vinyl Pool Installed in 1984.
    Bought house in 2011. BBB. Taylor K-2006 test kit.
    Sta-Rite 1HP pump (looks old). Hayward s244t filter.

  14. Back To Top    #14

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    Re: "Slime Green"

    Something must be happening. The water is grayish-green instead of solid green today and I can see almost a foot down into the pool. FC had is smallest daily drop so far, less than 4 ppm. I'll boost it back up and brush. We'll then see what tomorrow brings.
    Thanks for reading... - Tony
    Da' Pool: Intex 15'x42" 3284gal AGP EasySet (Inflatable Ring) - (Summer 2014: 27' round EW /w 6.5' deep end @ 22,500gal)
    Pump & Cart Mod: 1000gph Cart. 5ft² - 2 nylons, 24/7 OP. Traps bugs/bits, lasts longer/cleans easier = Happier Pool Owner!!
    The Bible for a "Trouble Free Pool" life = PoolSchool, the BBB method a TF100 test kit(Recommend Kits Compared). - Cleaning a Sand Filter
    Water looks like GLASS, if yours doesn't...SLAM IT! Feels nice and never been happier!!! :D

  15. Back To Top    #15
    dattia's Avatar
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    West Chester, PA
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    Re: "Slime Green"

    Something IS happening... and you are on your way to a crystal clear pool.
    27' round AG
    Hayward Matrix 1 1/2 HP Pump
    Hayward S210T Sand Filter

  16. Back To Top    #16

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    Re: "Slime Green"

    I can see the pool floor today so the process must still be working. A proper test kid should arrive in the mail tomorrow to hopefully help knock this thing out.
    Thanks for reading... - Tony
    Da' Pool: Intex 15'x42" 3284gal AGP EasySet (Inflatable Ring) - (Summer 2014: 27' round EW /w 6.5' deep end @ 22,500gal)
    Pump & Cart Mod: 1000gph Cart. 5ft² - 2 nylons, 24/7 OP. Traps bugs/bits, lasts longer/cleans easier = Happier Pool Owner!!
    The Bible for a "Trouble Free Pool" life = PoolSchool, the BBB method a TF100 test kit(Recommend Kits Compared). - Cleaning a Sand Filter
    Water looks like GLASS, if yours doesn't...SLAM IT! Feels nice and never been happier!!! :D

  17. Back To Top    #17

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    Re: "Slime Green"

    I have a question:

    I vacuumed a pretty thick layer of gunk off the pool floor this evening and now the water looks almost clear. Almost but not quite. I know that I need to remain at shock level until it's clear, I can pass the overnight test and no CC are present. I'll get the test kit very soon and will be able to properly test those items.

    I know that high chlorine levels can throw off Ph tests, but I measured today anyway. Ph has dropped to 6.8, TA has dropped to 80 and FC is 18 (using the dilution method). CYA is still 60 so I'll bump the chlorine level up to 24.

    Should I be concerned about the Ph and TA yet or should I wait until all of the chlorine tests are complete?
    Thanks for reading... - Tony
    Da' Pool: Intex 15'x42" 3284gal AGP EasySet (Inflatable Ring) - (Summer 2014: 27' round EW /w 6.5' deep end @ 22,500gal)
    Pump & Cart Mod: 1000gph Cart. 5ft² - 2 nylons, 24/7 OP. Traps bugs/bits, lasts longer/cleans easier = Happier Pool Owner!!
    The Bible for a "Trouble Free Pool" life = PoolSchool, the BBB method a TF100 test kit(Recommend Kits Compared). - Cleaning a Sand Filter
    Water looks like GLASS, if yours doesn't...SLAM IT! Feels nice and never been happier!!! :D

  18. Back To Top    #18

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    Re: "Slime Green"

    Can someone answer the question about my drop in Ph? I understand that you can get a false high reading with high Chlorine levels but I've not read anywhere here about possible false low readings.
    Thanks for reading... - Tony
    Da' Pool: Intex 15'x42" 3284gal AGP EasySet (Inflatable Ring) - (Summer 2014: 27' round EW /w 6.5' deep end @ 22,500gal)
    Pump & Cart Mod: 1000gph Cart. 5ft² - 2 nylons, 24/7 OP. Traps bugs/bits, lasts longer/cleans easier = Happier Pool Owner!!
    The Bible for a "Trouble Free Pool" life = PoolSchool, the BBB method a TF100 test kit(Recommend Kits Compared). - Cleaning a Sand Filter
    Water looks like GLASS, if yours doesn't...SLAM IT! Feels nice and never been happier!!! :D

  19. Back To Top    #19

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    Re: "Slime Green"

    What are you testing with?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  20. Back To Top    #20

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    Re: "Slime Green"

    Quote Originally Posted by duraleigh
    What are you testing with?
    Still testing with the HtH 6-way kit (from Wal Mart) that I purchased on Saturday. I have a FAS-DPD Chlorine (K-1515A) kit on order and it should be waiting in the mailbox when I get home this evening so that I can get more accurate Chlorine numbers.

    I'm sold on the BBB method. The pool has went from beyond nasty to almost perfect in 6 days under horrible weather conditions. The temp hit 114 yesterday which was the hottest day in my lifetime and only one degree shy of the hottest day ever recorded here (1936).

    The plan is to get through the rest of the season with what I've got and then order a TF-100XL next spring.
    Thanks for reading... - Tony
    Da' Pool: Intex 15'x42" 3284gal AGP EasySet (Inflatable Ring) - (Summer 2014: 27' round EW /w 6.5' deep end @ 22,500gal)
    Pump & Cart Mod: 1000gph Cart. 5ft² - 2 nylons, 24/7 OP. Traps bugs/bits, lasts longer/cleans easier = Happier Pool Owner!!
    The Bible for a "Trouble Free Pool" life = PoolSchool, the BBB method a TF100 test kit(Recommend Kits Compared). - Cleaning a Sand Filter
    Water looks like GLASS, if yours doesn't...SLAM IT! Feels nice and never been happier!!! :D

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