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Thread: Newbie - Green Algae pool - Finding CYA

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    Newbie - Green Algae pool - Finding CYA

    I am trying to clear the algae in my pool. Feel like I am stuck going in a circle. I have been reading your pool school. Don't have the recommended tester...yet, will be getting one! Just had my water tested at pool store, I can't tell which reading is CYA? Readings I have are:

    FC 6.06 ppm
    TC 6.26 ppm
    CC 0.2 ppm
    PH 7.7
    Hardness 436 ppm
    Alkalinity 96 ppm
    Copper 0.2 ppm
    Iron 0.1 ppm
    Phosphate 809 ppb

    Trying to figure out CYA so I know what I need to bring to shock level consistently to get rid of algae, I believe this is the right step forward from what I read. Any help is appreciated. Thank you!
    SRM
    Inground 23x40, 21000 gallon plaster pool
    Pump 1 1/2 HP, Filter 360 Cartridge
    Frog Mineral Chlorine Pac Sanitizer

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    Piolin's Avatar
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    Re: Newbie - Green Algae pool - Finding CYA

    What kind of pool you have? What is the volume of your pool?
    8,400 gal Intex, 3K GPH pump, 16" sand filter, SWG CG-28669, TF100 test kit, speed stir, K-1766 Taylor salt test.

    The corner stone of TFP
    Pool School - Chlorine / CYA Chart

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    Mod Squad pooldv's Avatar
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    Re: Newbie - Green Algae pool - Finding CYA

    Welcome to TFP!

    None of those is CYA. CYA is sometimes referred to as stabilizer.

    Piolin,
    Pool info is in OP'S sig.
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    Re: Newbie - Green Algae pool - Finding CYA

    There is no CYA listed on your results BUT even if it were it would not mean much as pool store tests cannot be trusted. We see if over and over I am sad to say.

    Lets wait until your good test gets there. Which one are you getting?

    I see in your signature that you have the frog pack. Do you see the metals in your water? They are from the frog pack and are NOT good for your pool.

    Please do so reading here:

    Pool School - ABCs of Pool Water Chemistry

    and here:

    Alternative sanitizers and pools--The Truth!!

    The top one is the why and how of TFP. The second one will talk to you about your frog pack and others like it.

    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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    Piolin's Avatar
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    Re: Newbie - Green Algae pool - Finding CYA

    Ack, some times I hate tapatalk... 😊
    8,400 gal Intex, 3K GPH pump, 16" sand filter, SWG CG-28669, TF100 test kit, speed stir, K-1766 Taylor salt test.

    The corner stone of TFP
    Pool School - Chlorine / CYA Chart

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    Re: Newbie - Green Algae pool - Finding CYA

    Quote Originally Posted by kimkats View Post
    There is no CYA listed on your results BUT even if it were it would not mean much as pool store tests cannot be trusted. We see if over and over I am sad to say.

    Lets wait until your good test gets there. Which one are you getting?

    I see in your signature that you have the frog pack. Do you see the metals in your water? They are from the frog pack and are NOT good for your pool.

    Please do so reading here:

    Pool School - ABCs of Pool Water Chemistry

    and here:

    Alternative sanitizers and pools--The Truth!!

    The top one is the why and how of TFP. The second one will talk to you about your frog pack and others like it.

    Thank you for your help. Today I ordered the TF-100 test kit. Any suggestions to do while I wait for the test kit? Pool is completely green at this point. I have had this pool for several years and I have never had algae like this that I cannot get to clear. This past Tuesday I added 4-128 oz 12.5% chlorine and yesterday from the pool store Swamp Treat Algicide (% Sodium Bromide) - what a waste no change, actually looks worse! Quickly learning pool store is not the way to go! Appreciate your help.
    SRM
    Inground 23x40, 21000 gallon plaster pool
    Pump 1 1/2 HP, Filter 360 Cartridge
    Frog Mineral Chlorine Pac Sanitizer

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    Mod Squad pooldv's Avatar
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    Re: Newbie - Green Algae pool - Finding CYA

    Add a jug of bleach daily and brush.
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Re: Newbie - Green Algae pool - Finding CYA

    Any suggestions to do while I wait for the test kit? Pool is completely green at this point.
    For that size pool, you can pour a small jug of Clorox (I think it's about 90 oz.) into the pool each evening after the sun is off the pool. Do that every evening until your test kits gets to you (Maybe Wednesday).

    Then post the results right away and we'll all help you beat the Algae.

    PS - be ready to buy more bleach than you ever have....it will embarrass you at check-out.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Newbie - Green Algae pool - Finding CYA

    I would find a pool store that can give you CYA that is one of the most important things to understand to control algae. Most people that have used pucks for many years have CYA in the range of 100-300. I know mine was at least 300 before I found this place and I drained pool to get back to 50. This link is really great you can see how drastically CYA affects the amount of HOCL(which actually kills the algae)http://troublefreepool.com/~richardfalk/pool/HOCl.htm
    For instance at a CYA of 50 and FC of 10 has the same HOCL(amount of chorine that will kill algae) as CYA of 100 and a FC of 20. If your CYA is 100,200,300 you can see your FC would need to be ridiculous amounts. This is why its recommended to reduce your CYA before you SLAM. I would say most people here are here now because of this simple fact. Pucks increase CYA, CYA never really goes away unless your drain and refill. Eventually you are over 100 or 200 CYA and your pool store recommended FC level will never kill your algae and you get a algae bloom. Then its back to store for shock(which adds even more CYA) and algaecide. Its a very bad loop we have all been until we got here an reduced CYA and followed the method.

    Bottom line you need to know CYA and keep it 40-50. Then life is good so find a store that will give you CYA and post it so we know how much chlorine to SLAM with and advise you how to get to a reasonable number of CYA.
    Location Charlotte NC. Pool is a IG vinyl liner, 18X36 lagoon approx. 20,000 gallons odd shaped pool with different depths. 2 skimmers, 3 returns. Hayward 1HP pump, Hayward cartridge filter, Hayward chlorine feeder, Laars 250,000 BTU heater. Stenner pump with #2 tube for chlorine injection. Leslie branded Taylor test kit

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    Mod Squad kimkats's Avatar
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    Re: Newbie - Green Algae pool - Finding CYA

    I hate to say this BUT the CYA test is the test the pool stores get wrong the most Do not bother using your time having that test done.

    For right now just add a jug each day like Dave said. When your test kit gets there test and we will go from there.

    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: Newbie - Green Algae pool - Finding CYA

    Thanks for all the help. Adding a gallon of bleach each day for now. Test kit has shipped, hopefully will be here in a few days. I will post results or help with using the kit once I receive it!
    SRM
    Inground 23x40, 21000 gallon plaster pool
    Pump 1 1/2 HP, Filter 360 Cartridge
    Frog Mineral Chlorine Pac Sanitizer

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    Mod Squad kimkats's Avatar
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    Re: Newbie - Green Algae pool - Finding CYA

    SWEET! Have you found the videos? They are very helpful!

    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: Newbie - Green Algae pool - Finding CYA

    OK...I got the test kit today. I followed directions in the kit and the pool school and I believe my CYA is 140. I also did the chlorine drop test, it only turned pink after sitting for some time. Suggestions on what to do now?

    Reading in the pool school, should I drain some of the water and refill?
    SRM
    Inground 23x40, 21000 gallon plaster pool
    Pump 1 1/2 HP, Filter 360 Cartridge
    Frog Mineral Chlorine Pac Sanitizer

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    Re: Newbie - Green Algae pool - Finding CYA

    I've been reading from the pool school but haven't seen the videos. Where should I be looking for the videos?
    SRM
    Inground 23x40, 21000 gallon plaster pool
    Pump 1 1/2 HP, Filter 360 Cartridge
    Frog Mineral Chlorine Pac Sanitizer

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    Piolin's Avatar
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    Re: Newbie - Green Algae pool - Finding CYA

    8,400 gal Intex, 3K GPH pump, 16" sand filter, SWG CG-28669, TF100 test kit, speed stir, K-1766 Taylor salt test.

    The corner stone of TFP
    Pool School - Chlorine / CYA Chart

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    Re: Newbie - Green Algae pool - Finding CYA

    Here are a couple. I think Taylor has some also, but this has the FC and CYA which would be most useful to start https://www.youtube.com/user/TF100TestKit

    If you got CYA 140 with the dilution method, yeah, you will need to drain.

    The FC test should turn pink immediately. If it doesn't there is < 0.5 ppm FC
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

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    Re: Newbie - Green Algae pool - Finding CYA

    Draining water from the pool now. Can I drain 50% and refill or do I need to drain more than that?
    SRM
    Inground 23x40, 21000 gallon plaster pool
    Pump 1 1/2 HP, Filter 360 Cartridge
    Frog Mineral Chlorine Pac Sanitizer

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    Piolin's Avatar
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    Re: Newbie - Green Algae pool - Finding CYA

    You can also do the OTO chlorine test to see if you have any at all...


    Pool School - OTO Chlorine Test
    8,400 gal Intex, 3K GPH pump, 16" sand filter, SWG CG-28669, TF100 test kit, speed stir, K-1766 Taylor salt test.

    The corner stone of TFP
    Pool School - Chlorine / CYA Chart

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    Mod Squad kimkats's Avatar
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    Re: Newbie - Green Algae pool - Finding CYA

    I would drain like you are talking about just be on the safe side. Make sure to let the old and new water mix good before you do any tests. You can and should add chlorine asap.

    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: Newbie - Green Algae pool - Finding CYA

    Chlorine is very low. Planning to drain at least 50% of water and start refill, add chlorine as water refills. How do I get an idea of how much chlorine I need? Do I retest CYA once pool is refilled?
    SRM
    Inground 23x40, 21000 gallon plaster pool
    Pump 1 1/2 HP, Filter 360 Cartridge
    Frog Mineral Chlorine Pac Sanitizer

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