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Thread: Low FC and rising CYA - help! Is there any options?

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    Low FC and rising CYA - help! Is there any options?

    Hi everyone,
    Thank you in advance for all the helpful advice. Iíve been doing lots of reading and decided I should ask the trusted forum for some advice on concerns I have regarding my pool readings and if i have any options...

    So here goes: I have some changes in my FC and CYA levels.

    Heres some info:
    23k in ground pool
    Located in So Cal (hot,sunny,random rain)
    Water temp: 70-75
    FC: 1
    pH: 7.5
    TA: 150
    CYA: 60

    Iíve been bringing up my FC levels to at least 5, but it drops again the next time I check it. Its as if I canít keep chlorine in pool? The tablets i use have Trichlor/Dichlor in them. I notice that my CYA previously was 50. Recently it has gone up to 60.

    My concerns:
    What can I do to keep FC up?
    My CYA is slowly climbing. I replaced the water in the pool about a year ago. Do I need to be concerned with the CYA:60 reading? I do add water to the pool as needed. Is lowering CYA only done through changing the water? What number should be cause for alarm?
    The water is clear- Iíve been diligent to try to make sure nothing will start to grow in pool by testing my levelsÖ but I just donít understand what to do next. HELP!?

    I appreciate any help you all can provide. Thanks again.

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    UN1017's Avatar
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    Re: Low FC and rising CYA - help! Is there any options?

    You probably have some low level algae growth consuming your chlorine and you are barely keeping up. Your choice to use tablets will increase your CYA levels to the point to where your chlorine will be ineffective.

    At this point, you need to switch to bleach or invest in a SWG in order to keep you water properly sanitized. A CYA level of 60 is not unmanageable but you don't want it any higher and yes, you are correct, the only way to lower CYA is to drain water and refill.
    15'x30' IG - Roman-style - 14K - Pebble Fina Classico
    Filter: Jandy CL460 Pump: Jandy Stealth SHPF1.5 SWG: Jandy AquaPure 1400 Cleaner: Jandy RayVac Test Kit: TF-100 w/SpeedStir

    Chlorine/CYA Chart----Extended Test Kit Directions----SLAM

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    Re: Low FC and rising CYA - help! Is there any options?

    Thank you for the help.
    I use the TK-100 test kit.
    I add bleach, which seems to be often...based on poolmath... I'm showing rookie status here, but is that normal?

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    Re: Low FC and rising CYA - help! Is there any options?

    Yup. Stop the pucks!

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    Re: Low FC and rising CYA - help! Is there any options?

    Ok, so out with the chlorine floater tabs... thanks! But constantly adding bleach, is that the norm?Is it because its summer? Sun? Sadly didnt encounter issue like this until now

    - - - Updated - - -

    If I remove the floater tabs, with my FC not staying up... won't that be worse? Is there chlorine tabs without the trichlor/dichlor that adds cya? Or is that wishful thinking...

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    UN1017's Avatar
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    Re: Low FC and rising CYA - help! Is there any options?

    Quote Originally Posted by fishoutofh20 View Post
    Ok, so out with the chlorine floater tabs... thanks! But constantly adding bleach, is that the norm?Is it because its summer? Sun? Sadly didnt encounter issue like this until now

    - - - Updated - - -

    If I remove the floater tabs, with my FC not staying up... won't that be worse? Is there chlorine tabs without the trichlor/dichlor that adds cya? Or is that wishful thinking...
    Very normal. With a pool your size it would be reasonable to add 1/3 to 1/2 gallon of 8.25% bleach per day. Daily additions are the norm if you want keep your pool trouble free. Unfortunately, the only other solid form of chlorine you could probably use would be calcium hypochlorite but then your CH would build up. You don't want that either.
    15'x30' IG - Roman-style - 14K - Pebble Fina Classico
    Filter: Jandy CL460 Pump: Jandy Stealth SHPF1.5 SWG: Jandy AquaPure 1400 Cleaner: Jandy RayVac Test Kit: TF-100 w/SpeedStir

    Chlorine/CYA Chart----Extended Test Kit Directions----SLAM

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    Re: Low FC and rising CYA - help! Is there any options?

    Good to know - about the daily adding of bleach being normal. I feel that the pool should have some type of chlorine floater...but very true, I dont want my CH going up. Yet I don't want my CYA to continue to climb, with the current pucks.

    The idea of draining and starting over...yikes!

    So with the CYA:60 being higher than the suggested 30-50 reading, maybe a partial drain? To get the CYA under control? And remove pucks... Does that sound like a good plan of action?

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    Re: Low FC and rising CYA - help! Is there any options?

    You can be just fine with that CYA level! Get rid of the pucks ASAP so it doesn't get higher. Chlorine seems to be expensive, but never as much as pool store chemicals! Get that FC above target and NEVER below minimum and you are golden!

    Be a smart shopper of chlorine. Every place I shop, I check prices vs strength, and always a mindful eye on age. Look for codes on the bottle. I just bought 8.25% bleach today at Target with a date code of 15206. That is the 206th day of 2015. It is less than a week old. I also get great deals at Menard's sometimes. $1.99/gal for 12.5%!!! Check those date codes, though!

    - - - Updated - - -

    Whoops, just noticed your FC was REALLY low. Do you know how to slam?

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    Re: Low FC and rising CYA - help! Is there any options?

    Thank you I really appreciate all the advice. Great tip about the bleach date codes, will keep eye out. And remove those darned pucks Now if only there would be a simpler solution or process to lower CYA...

    Thanks again

    - - - Updated - - -

    I have read the slam section... sounds horribly confusing. So based on the low to nonexistent FC, should I slam? Looks like I would still have to replace water before I start.. did I read that correctly?

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    Re: Low FC and rising CYA - help! Is there any options?

    Let us know your new test results after you refill. We will help get you through the slam. You have a great test kit and you found us. Good job!

    All of this information can be intimidating at first but it will all make sense soon!!

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    Mod Squad kimkats's Avatar
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    Re: Low FC and rising CYA - help! Is there any options?

    Pucks have to go yesterday. They add stuff to your water. ONE day they will find a way to make them chlorine but until then it is bleach all the way!

    Knowing you are in CA I wonder if you would be better off just riding the CYA level. It is up to you.

    It will take less bleach (FC) if your CYA was lower just to give you even more to think about.

    I add about 7 cups a day of chlorine (11%). Depending on the weather.

    I do keep my CYA a little lower so I can use pucks on the weekends we are not home. It is all about knowing what they do to your pool.

    So-----------

    -lower CYA by draining IF you can.
    -If not than will use more bleach but doable at your level.
    -Swim and have fun!

    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: Low FC and rising CYA - help! Is there any options?

    Being in SoCal, the solution to drain (even partial) may not be an option. (sigh) Now what?
    I will remove the pucks as recommended as it is adding CYA to the pool.
    But my question is this, how will chlorine be added in meantime, other than my bleach additions... or dont worry about that? Especially that my FC:1...I worry about not having any chlorine? But worry more about growing CYA
    What to do with this bucket of pucks? Any innovative ideas?
    Thanks again

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    Re: Low FC and rising CYA - help! Is there any options?

    Thank you for the advice Kim
    Yeah those evil pucks are gone, gone, gone!
    I feel all the bleach on daily basis seems a lot, but I guess thats normal...
    What to do - but just keep swimming? lol thanks again

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    Re: Low FC and rising CYA - help! Is there any options?

    To add chlorine without raising CYA, bleach (or liquid chlorine -same thing but different strengths) or cal-hypo are your only choices.

    Keep the pucks cool and dry. You may want to use them someday and they will last a long time.

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    Re: Low FC and rising CYA - help! Is there any options?

    Thank you
    I'll store those darned pucks (you're right, it would be a waste to get rid of...)
    I'll be investing in lots of bleach in the meanwhile lol

    Thanks again

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    Re: Low FC and rising CYA - help! Is there any options?

    Quote Originally Posted by fishoutofh20 View Post
    how will chlorine be added in meantime, other than my bleach additions... or dont worry about that? Especially that my FC:1...I worry about not having any chlorine?
    Quote Originally Posted by fishoutofh20 View Post
    I feel all the bleach on daily basis seems a lot,
    What kind of answer are you looking for? When dealing with liquid chlorine (bleach), it's an everyday event. I add one quart everyday of no less than 12.5%. It's either that or deal with the latent consequences of using the pucks.

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    Re: Low FC and rising CYA - help! Is there any options?

    There is another option, a Salt Water Generator!
    5900 G Fiberglass IG pool (circa 1990), SWG Hayward Aqua Rite GoldLine (2013), IntelliFlo Variable Speed Pump (2013), Hayward Pro Sand Filter (circa 1990), Well water (no iron or other metals fortunately), test with Taylor K2006C, Charleston, SC

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    Mod Squad tim5055's Avatar
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    Re: Low FC and rising CYA - help! Is there any options?

    I think most of the posters have covered your issues well.

    1. Stop using solid chlorine products and your CYA will stabilize. It won't go down much unless your replace water, but it won't go up either.

    2. Add liquid chlorine every day. Bleach or higher % chlorinating liquid, your choice. You have to say above the minimum for Your current CYA level all the time.

    3. Don't miss a day of chlorinating your pool. No,chlorine = allowing algae a foothold in your pool. A SLAM at 60 CYA takes massive amounts of chlorine.
    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: Low FC and rising CYA - help! Is there any options?

    Thank you all so far for the knowledge and advice, its MUCH appreciated

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    Mod Squad kimkats's Avatar
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    Re: Low FC and rising CYA - help! Is there any options?

    We got ya covered!

    Feed your pool every day and SWIM!

    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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