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Thread: FC help please

  1. Back To Top    #1

    Join Date
    Apr 2012
    Location
    Seymour ct.
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    14

    FC help please

    Hey guys and gals. I have a 15x48 intex pool with the intex saltwater combo.
    It look nice and clear thanks to you guys. I have learned a lot since I been here. My question is my FC is at 3 in the morning and drops about 1 in the early evenings. I run the SWG for 5 hour at night. My CYA is at 29 now. Is this normal?
    What's the correct reading I should have?


    Salt 3000 last time I checked
    HC=120
    PH=7.8 a little high
    TA=80
    TC=2.5
    FC=3
    CYA=29

  2. Back To Top    #2

    Join Date
    Jun 2012
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    Allentown, PA
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    Re: FC help please

    Something isn't right about your TC FC levels. Total chlorine count has to be the same or higher than free chlorine. Also your CYA looks on the low side for a salt water setup. Have you checked the page from pool school on recommended levels for SWG vinyl (pool-school/recommended_levels)?

  3. Back To Top    #3

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    Apr 2012
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    Seymour ct.
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    Re: FC help please

    I'm sorry the TC is the same as FC. So don't go by the intex book?
    The book said to run the SWG for 3 to 4 hour but I run it at 5 hr to get 3 FC.
    It's say to have the CYA at 30-50. The chart here say 60-70.
    Will it hurt to boost the numbers up?

  4. Back To Top    #4

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    Re: FC help please

    Additional CYA will help hold your FC.
    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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  5. Back To Top    #5

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    Qwaxalot's Avatar
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    Jun 2012
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    439

    Re: FC help please

    Because you're not running the SWCG during the day, it would be normal to loose chlorine during the day The low stabilizer level isn't helping either.
    In the industry, CSP (Certified Service Professional) by the NSPI and it's successor the APSP. My company services over 600 pools every year. I think the practices regularly espoused on this forum (especially the BBB method) are outstanding; however my comments will be often oriented towards the goal of getting it done, and getting it done right now!

  6. Back To Top    #6

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    Apr 2012
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    Seymour ct.
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    Re: FC help please

    What would happen if I shock it and what would you recommend for my CYA level should be?

  7. Back To Top    #7
    JasonLion's Avatar
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    May 2007
    Location
    Silver Spring, MD
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    37,879

    Re: FC help please

    Nothing you have said suggests there is any reason to shock the pool.

    With a SWG, CYA should be between 70 and 80.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  8. Back To Top    #8

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    Apr 2012
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    Seymour ct.
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    Re: FC help please

    I keep adding liquid conditioner from leslie pool and it still read around 30. I'm almost done with the bottle.
    Is it getting eatting up with the free chlorine? This stuff is expensive!!!!!

  9. Back To Top    #9
    elwood58's Avatar
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    May 2012
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    Sun City West Arizona (2nd Home)
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    639

    Re: FC help please

    CYA does not leave your pool water, except through splash out and replacement or evap. CYA can take a while to show up in testing, less so for liquid than powder CYA. Give it a little time. In the meantime, either consider running your SWG during daylight hours, so it produces chlorine when you are losing/using it most.

    Does not look like you need to shock.
    19204 Gallon L Shape with a 10X10 2nd Step Baja Ledge. Intellichlor IC-40, IntellipH, Cartridge Filter, Pentair Heater/Chiller (Heat Pump). Tons of Deck with Deck Jets. Construction Complete 6/5/17.

    "If you don't measure it, you can't manage it!"

  10. Back To Top    #10

    Join Date
    Jun 2010
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    Glendale, CA
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    Re: FC help please

    It's probably just not showing up on the test yet. It can take a week or so. FC is not going to eat the CYA. How are you testing your CYA? What number are you targeting for CYA?

    Judging by the description there is nothing wrong with your pool. It's losing about 2ppm per day and that's what the generator is supplying with a 5 hr runtime overnight. The only problem is there will be times when the pool has close to 0 FC - which could allow organic growth in the pool that will overwhelm the SWG.

    If you manually bring the FC level up to say 6ppm with bleach - and then let the SWG do it's thing for a few days hopefully you'll test 6ppm in the mornings and probably 4ppm in the evenings. If you find that the FC level drops lower and lower with time you probably just need to run the SWG a little longer each night - say 6 hrs.
    16K Gal Plaster | Compupool SWG | Intelliflow VF | TF-100

  11. Back To Top    #11

    Join Date
    Apr 2012
    Location
    Seymour ct.
    Posts
    14

    Re: FC help please

    Thanks guys! I'm using test strips. I'm also trying to target the CYA at 70-80 seeing must of the day the pool is in sunlight.

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