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Thread: 2 weeks to get pool clean

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    2 weeks to get pool clean

    I have to warn you ahead of time I'm using a Leslie's DPD test kit which only gives me "accurate" readings up to 5ppm for FC and CC is a guess based on color change and the CYA test doesn't tell me anything about the CYA below 30ppm.

    100,000~ gallons
    > 5 FC
    < 1 CC
    > 5 TC
    7.2 PH
    60 Alkalinity
    190 CH
    < 30 CYA

    So basically I opened my pool this season at < 10 CYA (maybe even 0). I bought 40 lbs of dichlor and have put about 30lbs of it in the pool already. Doing the math, I should have about 30ppm of CYA in there by now but it's mostly likely around 15ppm.

    Right now, my pool is green and a little cloudy. I just poured 10 gallons of 12% bleach into it plus about 3-4 pounds of dichlor. I started at about .5 FC. The sun is basically gone.

    My questions:
    1. Do I have to reach shock to clear my green pool?
    2. If so, should I pour the rest of my 5 gallons of bleach in there or should I be okay with what I've already added?

  2. Back To Top    #2
    JasonLion's Avatar
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    Re: 2 weeks to get pool clean

    1) Have to?? In practice, yes you need to get to shock level and raise it back up to shock level several times so the pool spends some time there.
    2) If you added the chlorine after the sun went down, then you added enough to get to shock level. However, it isn't clear if you are still at shock level or not, since it might have gone down since you added chlorine.

    Things will be much easier when CYA gets up to at least 30. Right now you are losing a lot of chlorine to sunlight, which makes maintaining shock level very challenging.

    In the long run you will be much better off if your get a FAS-DPD chlorine test. In the meantime, to get a better idea of what the FC level is with that test kit, you can do the test with dilution. Mix one part of pool water with two equal parts of chlorine free water (for example distilled water), do the test with that, and multiply the result by three.
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  3. Back To Top    #3

    Re: 2 weeks to get pool clean

    I used 1 part pool water 2 parts Poland spring water and got a reading of 2.5. Going to pour the rest of my dichlor in there after doing a backwash.

    Edit
    Don't think the dichlor will be enough. Putting the bleach in too.

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    Re: 2 weeks to get pool clean

    I wish they would just engineer some bacteria that feeds on algae and then decomposes once it runs out of food.

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    Re: 2 weeks to get pool clean

    If you are wanting to get this cleared in two weeks, I would recommend a good test kit. I highly recommend the TF100. Link is in my signature
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  6. Back To Top    #6

    Re: 2 weeks to get pool clean

    I tested the FC/TC just now (2 hours after adding more chlorine):
    FC: 12 (4*3)
    CC: 0
    TC: 12

    I think I'll let it sit overnight and check it out tomorrow morning.

    I would love to invest in that test kit but even if I order it today, I won't get it for a few days at least. If my pool is still green in a few days, I'm in trouble as I'll need a week or more to filter out all the dead algae. After the pool is clean, my CYA probably won't be too high for my current kit to do the job.

    If my CYA goes up or I run out, I'll definitely get the kit though.

  7. Back To Top    #7

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    Re: 2 weeks to get pool clean

    you're trying to manage a very large pool - if it was me, I'd order the kit now
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    Butterfly's Avatar
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    Re: 2 weeks to get pool clean

    Quote Originally Posted by nhguy
    you're trying to manage a very large pool - if it was me, I'd order the kit now
    ditto

    Getting a good test kit was/is the BEST investment we made in our pool. Period.
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  9. Back To Top    #9

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    Re: 2 weeks to get pool clean

    Quote Originally Posted by Butterfly
    Quote Originally Posted by nhguy
    you're trying to manage a very large pool - if it was me, I'd order the kit now
    ditto

    Getting a good test kit was/is the BEST investment we made in our pool. Period.
    Make that "double ditto" on the test kit.

  10. Back To Top    #10

    Re: 2 weeks to get pool clean

    So I let it run over night. There's still a significant amount of algae and it's still cloudy but I can almost see the bottom of the shallow end. I can't tell if I achieved shock but at least I'm winning the battle.

    The FC is reading over 5 when tested normally. I did the diluted test and got less than 5. I'll order that test kit

  11. Back To Top    #11

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    Re: 2 weeks to get pool clean

    If you order the test kit and can get the speed stirrer as well, that is another great investment.
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  12. Back To Top    #12

    Re: 2 weeks to get pool clean

    Current Condition:
    Brown algae on walls, cloudy water, greenish deep end.

    Time line:
    Day 1: Dark green, < 1 foot visibility
    Day 2: Light green, < 3 feet visibility
    Day 3: Pale Green, < 5 feet visibility
    Day 4: Pale Green near walls and whitish near bottom in the shallows, pale green in deep, < 5 feet visibility
    Day 5: Pale Green near walls and whitish near bottom in the shallows, pale green in deep, < 5 feet visibility

    As you can see I haven't had much improvement in the last 2-3 days. I've been brushing every day. I make sure to skim off all the leaves. I vacuum a little. I even took one of the seven skimmers and attached a host to it and left the other end at the bottom of the pool. Last night my FC had no noticeable drop (still waiting for that kit to come in). Am I missing something? What should I do?

  13. Back To Top    #13
    JasonLion's Avatar
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    Re: 2 weeks to get pool clean

    Quote Originally Posted by vik
    Current Condition:
    Brown algae on walls, cloudy water, greenish deep end.
    If you are brushing every day, and the pool is at shock level, I wouldn't expect there to be any algae on the walls. The brushing should have removed it and shock level should have prevented it from growing back.

    What are your current test results?
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  14. Back To Top    #14

    Re: 2 weeks to get pool clean

    >5 FC
    0 CC
    7.2 PH
    60 Alkalinity
    190 CH
    < 30 CYA

    I haven't received the test kit yet so I don't have exacts. I can say that since the 18th I've used nearly 40 gallons of chlorine which is about 8 gallons a day so even if I lost 80% of my chlorine daily I should have remained at shock levels. I also tried to put the bulk of my chlorine at night so my low CYA wouldn't be as much of a factor.

    The thing is when I brush, all the algae doesn't come off. Most of it stays on the wall. It's VERY stubborn.

  15. Back To Top    #15

    Re: 2 weeks to get pool clean

    So, I put in another 10 gallons of 12% and spent 3 hours brushing the pool. Hopefully, I'll see some improvement tomorrow morning.

  16. Back To Top    #16

    Re: 2 weeks to get pool clean

    FC 3.5-4.0
    CC 1.0-1.5

    I got the test kit! I haven't put any chlorine in since last night so it must have been shocked at the time. Still brushing and vacuuming. I put in nylon knee high stockings on the skimmer baskets today too. I relay hope I am able to see the bottom soon

  17. Back To Top    #17
    JasonLion's Avatar
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    Re: 2 weeks to get pool clean

    Test the PH and make sure it is between 7.2 and 7.8. Then, go back up to shock level. Doing an overnight FC loss test tonight will give you a good idea of how things are going.
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  18. Back To Top    #18

    Re: 2 weeks to get pool clean

    Yesterday Night:
    FC 12.0
    CC 0.5
    PH 7.2

    This morning 2 hours after sun rise:
    FC 10.5
    CC 1.0
    PH 6.8
    TA 90
    CH 190
    CYA 35

    I didn't lose much of my FC overnight but there's still algae on the walls and the deep end still looks green. I'm guessing the dichlor I used to shock the pool dropped my PH enough overnight to make it ineffective (was losing too much chlorine to the sun to keep using bleach)?

  19. Back To Top    #19
    JasonLion's Avatar
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    Re: 2 weeks to get pool clean

    You need to be extremely careful about using dichlor to shock, as it raises the CYA level extremely quickly. Higher CYA levels require more chlorine, and if you keep using dichlor you quickly get into a cycle where you can't raise the FC level fast enough to keep up with the increasing CYA level.

    If you have algae on the walls you need to brush the entire pool, and should be brushing daily while at shock level.

    You lost 1.5 ppm of chlorine, CC is above 0.5, and there is visible algae, so you need to continue shocking.

    Again, raise the PH up to at least 7.2 before adding more chlorine.
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  20. Back To Top    #20
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    Re: 2 weeks to get pool clean

    Just agreeing with Jason and adding a little to what he said. Once you are close enough to actually need to run the OCLT you'll need to make sure you do it late enough, and early enough that there will be no sun on the pool. Also, now that you have a good test kit you can test and add as you need to and it'll go faster if you'll keep it as close to shock level as often as you can.
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