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Thread: Zero Chlorine after slam

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    Zero Chlorine after slam

    Im so confused!!!My pool was calculated by Leslie at 17000 gal. I tried to slam my pool last night using 6 (96oz) jugs of chlorine. This morning my FC was zero. my CYA is 30. Im in the process of dissolveing 2lbs of conditioner to get the CYA up. I called a different pool store today and they recalculated my pool at 21000 gal?? Which when I calculated the slam amount its only 1 gallon difference. They told me to check for phosphates. Never had a problem with this before. Could this have eaten all of that chlorine??
    Philly, Install 6 yrs ago. 27Round- Above ground. Hayward Xtreme Cartilage

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    Patrick_B's Avatar
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    Re: Zero Chlorine after slam

    Welcome to the forum,

    SLAM is a process and not something to be done in a night. Do you have one of the test kits we recommend, and what does your water look like? Mixing our advice with the store won't get you anything but confusion with mixed suggestions.
    TFP Moderator
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    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
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    Texas Splash's Avatar
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    Re: Zero Chlorine after slam

    Welcome! Golden rule - Avoid the pool store for testing, advice, or products. You simply won’t get the advice/service you deserve and you will waste money on products your pool doesn’t need. Do not add anything to your pool other than what is advocated by the TFP site or its experts if you truly want to follow the TFPC method. You’ll have a happier pool, spend less time maintaining your pool, and probably save some $$ in the process. The following are short articles from this site that you will see linked in my signature below: Pool School, Recommended Levels (for YOUR pool), PoolMath Calculator, SLAM, and the Chlorine/CYA Chart.

    FYI, here's a little excerpt about TFP's "SLAM":

    SLAM is the term used when we “Shock” our pool to a higher “Level” of Free Chlorine (FC) and “Maintain” it that way until 3 objectives are met:
    1. Water is clear
    2. You do not lose any more than 1ppm of FC overnight (that's the OCLT)
    3. CC (Combined Chlorine) is <.5
    ** You MUST meet ALL 3 items above to properly do a SLAM. Simply “spiking" the FC higher than normal isn't SLAMming, therefore there’s a good chance your algae will return.

    As Patrick already emphasized - you MUST get one of the recommended test kits. That's the only way to confirm the readings above that we need to see.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
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    Richard320's Avatar
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    Re: Zero Chlorine after slam

    Welcome!

    If it's not too late to stop you, don't add any more conditioner. 30 CYA is ideal for the Shock Level And Maintain process. What you did was just add a lot of bleach. You probably hit Shock Level but forgot the Maintain.

    Sadly, we need some answers from you before we have answers for you.
    1) Do you have a test kit?
    2) What does the water look like?
    3) Can you follow written directions?
    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.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Zero Chlorine after slam

    Quote Originally Posted by Patrick_B View Post
    Welcome to the forum,

    SLAM is a process and not something to be done in a night. Do you have one of the test kits we recommend, and what does your water look like? Mixing our advice with the store won't get you anything but confusion with mixed suggestions.
    I have the test kit that is sold at Leslie's. My pool is green, just opened yesterday. Im beginning not to trust the advise from the pool stores. After learning so much from this site, I've realized how many unnecessary products I was advised to purchase! And they wont even discuss the use of household bleach!
    Philly, Install 6 yrs ago. 27Round- Above ground. Hayward Xtreme Cartilage

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    Patrick_B's Avatar
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    Re: Zero Chlorine after slam

    You will need to order a kit most likely then. You have to have the correct one for Chlorine testing and stores almost never have it. I'm not sure what kit you mean, but I am sure you will have to order a FAS/DPD Kit at minimum.
    TFP Moderator
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    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
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    Mod Squad tim5055's Avatar
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    Re: Zero Chlorine after slam

    They don't make money on bleach, thus they don;t want to talk about it.

    I will tell you, it didn't turn green overnight and it will take time to clear. But, we can teach you how to get it sparkling and keep it that was for a lot less money than the pool store.

    Not much credence is given to pool store testing around here. While you would think that a "professional" would be the best, unfortunately in most cases it is quite the opposite. Between employees who blindly trust the word of chemical sales representatives and high school kids working in the pool store for the summer you end up with poor results from their testing. But, what can you do?? We base our pool care system on accurate testing and only adding what the pool needs, when it needs it. To do that you need your own accurate test kit. If you can tell us exactly which Leslies kit you have we can advise what you need to order to get ready to test your water.

    While you wait for it to get delivered, you have a homework assignment. Start with Turning Your Green Swamp Back into a Sparkling Oasis
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: Zero Chlorine after slam

    Can you recommend Where do I order the pool strips? I have more questions.
    1. Someone at the pool store recommended I test for Phosphates. That maybe it ate all the cholrine overnight? Do you think that could be the case?
    2. Should I not be surprised that the chlorine was zero? like you said...its a process!
    3. I thought that since CYA is on the low end having a higher CYA would help protect the chlorine from the sun?
    Philly, Install 6 yrs ago. 27Round- Above ground. Hayward Xtreme Cartilage

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    n240sxguy's Avatar
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    Re: Zero Chlorine after slam

    Phosphates are algae food. Chlorine kills algae. Phosphates don't do anything to chlorine. Forget you ever heard the word phosphate.


    30K gallon IG vinyl. 1.5HP 2-speed Waterway Mustang pump. 600 lb sand filter. Polaris 280. Circupool SI-60+. TF-100

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    Re: Zero Chlorine after slam

    Proper Chlorine levels and dead, or non-existent algae make Phosphates irrelavant. Don't worry about them.
    TFP Moderator
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    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
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    Re: Zero Chlorine after slam

    Quote Originally Posted by hughes215 View Post
    Can you recommend Where do I order the pool strips?
    TFTestkits.net. Get the XL option, too, since you're clearing up a green pool.
    I have more questions.
    1. Someone at the pool store recommended I test for Phosphates. That maybe it ate all the cholrine overnight? Do you think that could be the case?
    Want to learn something horrifying? The manufacturer of Phos-free even says not to put it in a pool with algae! I''m not lying! Click on Instructions and read the last line: "Important: Algae must be treated prior to testing and lowering phosphates." And Leslies wants to sell you some now? All it will do is turn your pool milky.
    2. Should I not be surprised that the chlorine was zero? like you said...its a process!
    Not at all surprised. A green pool can go through bleach almost as fast as you can pour it at the very beginning of the process. That's why the SLAM instructions say to test every couple hours. Eight hours is too long.
    3. I thought that since CYA is on the low end having a higher CYA would help protect the chlorine from the sun?
    It does. And you do need it higher after you clear the algae completely. Shock level for 30 CYA is 12. For 50 CYA, it's 20. That's a whole lot of bleach. We've guided hundreds of people through this. We say 30 for a reason. And besides, Leslies probably got the test results wrong anyway. You don't want to be buying bleach this way, do you?

    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.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Mod Squad tim5055's Avatar
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    Re: Zero Chlorine after slam

    ^^^^^^^ What he said!
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: Zero Chlorine after slam

    LOL!! you guys rock!! I left the CYA soaking in a sock today in the skimmer Gonna rush home and whip it out. But I turned the pool off before I left for work since there was no chlorine to push around. At least I dont have to worry about going to test my water for Phosphates!! Straight to walmart for more bleach!! The battle wages on!!
    Philly, Install 6 yrs ago. 27Round- Above ground. Hayward Xtreme Cartilage

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    Mod Squad tim5055's Avatar
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    Re: Zero Chlorine after slam

    Quote Originally Posted by hughes215 View Post
    LOL!! you guys rock!! I left the CYA soaking in a sock today in the skimmer Gonna rush home and whip it out. But I turned the pool off before I left for work since there was no chlorine to push around. At least I dont have to worry about going to test my water for Phosphates!! Straight to walmart for more bleach!! The battle wages on!!
    Toss the sock in a bucket and save it. You can add it back later once the pool is sparkly clear.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: Zero Chlorine after slam

    I was also told the calcium was low @ around 150 and I need to add 17lbs of calcium hardness? But then the clerk said I dont have to worry about it now that it can wait? How important is this?
    Philly, Install 6 yrs ago. 27Round- Above ground. Hayward Xtreme Cartilage

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    Mod Squad tim5055's Avatar
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    Re: Zero Chlorine after slam

    Quote Originally Posted by hughes215 View Post
    I was also told the calcium was low @ around 150 and I need to add 17lbs of calcium hardness? But then the clerk said I dont have to worry about it now that it can wait? How important is this?
    Not at all important. Vinyl pools don't need calcium so they were setting you up for a later sale.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: Zero Chlorine after slam

    Pool stores are evil!! I'm in the process of slamming. Yesterday my pool went from brown to cloudy pool. Its looking good and this morning it held the chlorine, but its a guess since I dont have the correct tester yet. After the pool is clear do I continue to add chlorine to maintain normal levels or switch to powder shock?
    Philly, Install 6 yrs ago. 27Round- Above ground. Hayward Xtreme Cartilage

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    Re: Zero Chlorine after slam

    When you say you dont have the correct tester yet, do you have it on order?

    Stop reading this and order it!!! You are just setting yourself up for failure until you do. It will ship very fast. I bet you will have it by the end of the weekend.

    Bleach is the only thing you will ever need for chlorine.

    You really need to thoroughly go to Pool School.

    Don't read it once. Read it over and over until you understand it thoroughly. Know what household chemicals to add for what situation. Know how to SLAM and do an OCLT. Know everything about CYA and Chlorine.

    Use Pool Math Calculator to do all your calculations.
    6425g Intex Ultraframe 18'x48" AG
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    Mod Squad kimkats's Avatar
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    Re: Zero Chlorine after slam

    You are already on the right track! Finding TFP and asking questions! Well done!

    The powder shock and chlorine pucks add CYA to your pool. Too much CYA is a bad thing. It is a fine tuning thing. You want this _ _ much CYA so that you do not need as much bleach. If you have too little CYA the sun will burn off your bleach. If you have too much CYA you will need more bleach to fit off algae.

    The line for the pool math is a wonderful tool. Make sure to play with it until you understand it. If you do not understand how it works let us know and we can walk you through it.

    There is a LOT of info. here. Just take a bite at a time and chew it up until you are ready for your next bite.

    Let us know when your test kit comes in!

    Kim
    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: Zero Chlorine after slam

    I want to order the test kit ASAP. Should I get FAS/DPD for only chlorine or the full kit? Can I use the strips for all the other test...Alkanline, CYA etc?
    Also my water test at the pool store today showed Chlorine >5, CYA 10. Should I start adding CYA now?
    Philly, Install 6 yrs ago. 27Round- Above ground. Hayward Xtreme Cartilage

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