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Thread: Need some advice on green pool

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    Need some advice on green pool

    Hi I am new here but have reading through topics and pool school for a few weeks now and I am having a hard time with my pool now. We just bought a house with a pool and it was awesome for the first month and a half and now we are having constant problems with algae. I'm pretty sure I know what to do after all my reading but wanted some reassurance. The CYA levels in the pool are just over 100(I tested a few weeks ago and it was 100 but since have added some powdered shock so it's probably a little higher I would think). I let the FC levels get too low "0" at some point several weeks ago, bought some powdered shock and added it. The FC levels have been low since. 2 weeks ago I noticed the water wasn't very clear. I added like 2 gallons of bleach cause the chlorine was low again.(I only had test strips at the time) When I took it to Leslie's the woman told me everything was fine but CYA was really high(which I already knew) and she advised me to drain part of the pool and to change the sand in the filter since it had been at least 5 years since the sand was replaced. So here's what I am planning on doing:
    1. Draining the pool about halfway to get CYA down and then re-shocking it until it's clear
    2. getting the sand replaced on Friday
    Once these 2 things are done I can better keep track of FC levels and be saving a lot on chlorine.
    I was wondering if I should go ahead and drain the whole pool and start over, or just do what I had planned on doing in the first place. This is my dilemma. Any advice would be greatly appreciated.

    Oh and the green only showed up after we were gone for 3 days and not keeping up chlorine and filtering 24/7 like I had been doing. I don't think we ever got rid of the algae in the first place :/
    13500 gallons
    in-gound
    sand filter
    concrete
    age at least 5 years

  2. Back To Top    #2
    Richard320's Avatar
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    Re: Need some advice on green pool

    Before you do anything else, you need to get a decent test kit.

    Armed with facts, you can decide how much water needs replacement. And perform the shock process properly, for once and for all.

    And I wouldn't change the sand.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
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    Join Date
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    Re: Need some advice on green pool

    You have got to make lowering that CYA a priority. Most tests stop at 100, so you are likely far over 100. Adding any more powdered shock or tablets is going to continue to make matters worse.

    You do not need to change your sand. Ignore that.

    Drain your pool halfway, refill, test CYA. If you are still over 50, do it again based on the calculations you get from http://poolcalculator.com

    Don't drain the whole pool, that can cause your pool to float and can destroy it.

    Once you get your CYA in check, you can start the shock process as outlined in Pool School. DO NOT use any "powdered shock product". Your CYA will come right back up.
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
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  4. Back To Top    #4

    Re: Need some advice on green pool

    Ok so the sand is fine? How do you know? How long does it typically last? The last owner didn't replace it and he lived there 5 years. I have heard 3-5 years and 5-7 years. Of course the psi reading is only at 18. I made an appointment to get it done for Friday. I get so many different views so it's hard to know. As far as the test kit I got the FAS-DPD something that was like $30 and it tests TC,FC(only up to 5ppm), alkalininty, ph. But according to CYA chart chlorine needs to be around 39 ppm for shock levels. How can I test that high? I feel like I'm going in circles to get it where it needs to be. And a lot of money spent on chlorine. I started shocking Sunday night scrubbed it yesterday and added just over a gallon more bleach. I've since decided to give up and try draining some water before spending anymore on bleach. It's soo frustrating :/
    13500 gallons
    in-gound
    sand filter
    concrete
    age at least 5 years

  5. Back To Top    #5
    Mod Squad Bama Rambler's Avatar
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    Re: Need some advice on green pool

    Welcome to TFP.

    How old was the sand when they put it in the filter? How about a few million years old! A few years in a fliter isn't going to hurt it.

    There are a couple of reasons to change the sand but unless it's calcified or you're converting from Baq there's not much reason to change it.

    The chlorine test you got isn't the FAS-DPD if it'll only read up to 5 ppm. It's most likely the DPD. Does it use powder (R-0870) and drops (R-0871)? It will be a lot less frustrating once you get the correct chlorine test kit. You can buy just the FAS-DPD test or just the reagents if you prefer. You won't get the little scoop or the test vial if you buy just the reagents though.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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  6. Back To Top    #6

    Join Date
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    Re: Need some advice on green pool

    For an example, I recently changed my sand - only because the filter itself broke. Both were installed in 1981.

    You are doing the right thing by draining water first.

    Then, to measure high FC, you need the FAS-DPD. You can get the single test here:
    http://tftestkits.net/FAS-DPD-Chlorine- ... t-p47.html

    Don't get frustrated, just stay here and follow the advice offered. You'll be sparkly clean before you know it.
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
    If TFP has helped you, please click to SUPPORT TFP!

  7. Back To Top    #7

    Re: Need some advice on green pool

    Thanks for all the great advice. I just finished ordering the kit to test the chlorine levels. This should help tremendously once I get my CYA levels in check. I'm also going to cancel the sand replacement. I hadn't noticed any problems before the algae took over, so it's probably good. I'll let you know how it goes. I'd love to be able to swim this weekend. Fingers crossed.
    13500 gallons
    in-gound
    sand filter
    concrete
    age at least 5 years

  8. Back To Top    #8

    Re: Need some advice on green pool

    Thanks for all the advice given. I finally after a week passed all the tests and then it rained so it's clear and dirty now. But at least clear of algae. I proved my man wrong... I love it when that happens. It felt so good to be in our pool again after a couple of long weeks. Thanks TFP
    13500 gallons
    in-gound
    sand filter
    concrete
    age at least 5 years

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