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Thread: HELP - Does CYA matter if you have a pool liner

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    HELP - Does CYA matter if you have a pool liner

    I have my water tested at the local pol store. They test for CYA but they tell me just ignore the CYA reading because it doesn't matter since I have a pool liner. I'm having a hard time getting my chlorine level up this year and wondering if my pool store is giving me good advice.

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    Charlie_R's Avatar
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    Re: HELP - Does CYA matter if you have a pool liner

    Your pool store is full of it.

    CYA is important to knowing how much FC you need to keep the pool sanitary and algae free.

    Your pool store guy is probably confusing CYA with CH. CH doesn't matter as much with a liner pool, except if you let it get too high. Then it will cause scaling.
    15'x48" 4500 gallon Intex pool, buried 1.5 ft. Pac-Fab Dynamo 3/4 hp pump. Hayward S180T sand filter, bought used. Taylor K-2006 test kit. Rocket mass heater based wood fired pool heater.

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    Re: HELP - Does CYA matter if you have a pool liner

    Thanks Charlie R! I keep shocking and adding chlorine but my chlorine level remains very low. CYA level is ZERO. I will add some stabilizer and see if that helps.

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    Isaac-1's Avatar
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    Re: HELP - Does CYA matter if you have a pool liner

    It is very important to understand the CYA / Chlorine relationship, some CYA is good, too much is bad, and it is important to have the ratio correct.

    See the pool school link in the upper right, and pay particular attention to http://www.troublefreepool.com/conte...art-slam-shock
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
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    Mod Squad jblizzle's Avatar
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    Re: HELP - Does CYA matter if you have a pool liner

    What kind of chlorine are you using? I would hesitate trusting the pool store test for CYA level. I would get one of the recommended test kits to determine the actual levels before adjusting anything.
    Jason, TFP Moderator
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    Re: HELP - Does CYA matter if you have a pool liner

    I'm using 3" Omega Chlor Tabs and granular shock (which I dissolve before adding to the pool). Having the water tested again today. I'll see if they have any of the recommended test kits at the store - otherwise I'll buy one online.

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    Mod Squad tim5055's Avatar
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    Re: HELP - Does CYA matter if you have a pool liner

    Quote Originally Posted by callea View Post
    I'm using 3" Omega Chlor Tabs and granular shock (which I dissolve before adding to the pool). Having the water tested again today. I'll see if they have any of the recommended test kits at the store - otherwise I'll buy one online.
    they won't have one, very few stores stock them. Be careful, they may try to sell you a different kit saying " it's the same thing". It's NOT.

    If all you have ever used is pucks and granular chlorine it is almost impossible for your CYA to be zero unless you recently filled the pool with water. Solid forms of chlorine at about 50% CYA.

    Pool store testing is usually poor on a good day, usually useless.

    You are at a point where you need to make a decision, follow the pool,store advice or follow the TFPC method. Listening to both will not work.

    I would say order one of the recommended test kits now and take control of your pool care. The folks here will teach you the methods, but more importantly give you the knowledge of what is happening in your pool.

    Good luck
    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: HELP - Does CYA matter if you have a pool liner

    Quote Originally Posted by tim5055 View Post
    they won't have one, very few stores stock them. Be careful, they mat try to sell you a different kit saying " it's the same thing". It's NOT.

    If all you have ever used is pucks and granular chlorine it is almost impossible for your CYA to be zero unless you recently filled the pool with water. Solid forms of chlorine at about 50% CYA.

    Pool store testing is usually poor on a good day, usually useless.

    You are at a point where you need to make a decision, follow the pool,store advice or follow the TFPC method. Listening to both will not work.

    I would say order one of the recommended test kits now and take control of your pool care. The folks here will teach you the methods, but more importantly give you the knowledge of what is happening in your pool.

    Good luck
    Great posting!
    Rick
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    Re: HELP - Does CYA matter if you have a pool liner

    Well I haven't been to the pool store since I learned they were feeding me a line of ****. Got me a test kit (K-2006) and have been testing every day. Pool store was showing my CYA at zero. My tests consistently show CYA of 50. I was initially adding about a gallon and a quart of bleach each day to keep the FC level between 4 and 6. I did the OCLT and lost 0.8 so I'm not going to SLAM. After about a week I'm down to 1 gal of bleach per day. Everything else has remained balanced which is crazy because every time I would go in the store before they would tell me to throw some chemicals in it. I feel like I'm liberated. Thank you to whoever started this forum and to those that take the time to contribute.
    16x32 (21,000 gal est) vinyl pool. Hayward S244S sand filter. Polaris 9300si cleaner. Taylor K-2006 Test Kit. Maryland.

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    Mod Squad jblizzle's Avatar
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    Re: HELP - Does CYA matter if you have a pool liner

    Congratulations on taking control

    Now another tip: Use a 10ml water sample for the FAS-DPD test and each drop is then 0.5ppm ... no need for more precision than that.
    Jason, TFP Moderator
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    Re: HELP - Does CYA matter if you have a pool liner

    And for the past 4 years they were having me keep the CH at/above 200 and telling me to ignore CYA because I have a vinyl liner!!!???
    16x32 (21,000 gal est) vinyl pool. Hayward S244S sand filter. Polaris 9300si cleaner. Taylor K-2006 Test Kit. Maryland.

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    pwrstrk's Avatar
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    HELP - Does CYA matter if you have a pool liner

    That's opposite. The CH doesn't really matter with a liner unless you have really high CH. The CYA is very important. That's the level that determines what range you keep your FC in.
    Have you read the ABC'S Of Pool Water Chemistry 😎
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: HELP - Does CYA matter if you have a pool liner

    Yeah - I've read everything - I'm straight on it now. I was just pointing out how the pool store was giving me bad info. They have it backwards.

    - - - Updated - - -

    Yeah - I've read everything - I'm straight on it now. I was just pointing out how the pool store was giving me bad info. They have it backwards. I really think they try to help, but they just don't know what they're talking about.
    16x32 (21,000 gal est) vinyl pool. Hayward S244S sand filter. Polaris 9300si cleaner. Taylor K-2006 Test Kit. Maryland.

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    pwrstrk's Avatar
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    Re: HELP - Does CYA matter if you have a pool liner

    Your right for the most part. There may be some out there that understand it and won't steer you wrong, but they may know and just don't want to show it so they can sell product. The others just don't know any better and just sell chem's.
    Just my 0.02. 😎
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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