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Thread: Can't get FC up to appropriate level

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    Can't get FC up to appropriate level

    Opened Pool About two weeks ago. Had water tested at local pool store. Was told to add a variety of chemicals which I did. Levels came to where they needed to be, all excet for FC. Algae galor. Went back to store and was told to use the Green to Clean product with various intervals of shock. Did this, but still couldn't get rid of algae nor could I get the FC level to rise. I have shocked the pool a few more times since and still cant get FC reading up. Water is not as green and is very cloudy.

    Current readings are as follows:
    FC .5
    CC 1
    pH 7.5
    T/A 70
    CH 310
    CYA 60

    Any suggestions on how to get FC up and water clear. Tired of dumping chemicals in without much change.

    Thanks.
    Michael, 35,000 Gallon, Inground, Vinyl Liner, Pentair CCP 520 Cartridge Filter

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    Richard320's Avatar
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    Re: Can't get FC up to appropriate level

    turning-your-green-swamp-back-into-a-sparking-oasis-t4147.html

    Get your own test kit (FAS-DPD type)and a whole lotta chlorine. But the article explains it, so I'll stop typing now.

    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Re: Can't get FC up to appropriate level

    Thanks. I will check it out. Just got my TF 100 today.
    Michael, 35,000 Gallon, Inground, Vinyl Liner, Pentair CCP 520 Cartridge Filter

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    Mod Squad jblizzle's Avatar
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    Re: Can't get FC up to appropriate level

    Welcome to the forum!!!!

    As you will learn when you read the article linked to above (and then read the entire Pool School ... see upper right of forum page), shock is a "verb" and not "noun" on this forum. It is a process (which may take days and many gallons of chlorine(bleach)) and not a product you buy and throw into the pool once.

    If you have put a lot of "shock" into the pool from the local store, depending on the type it may have raised your CH or CYA (which may not register yet).

    I had just written to suggest getting a test kit and I now see you have!!! That is a GREAT first step!!! and hopefully means you have been reading some of the Pool School already.

    Follow the excellent directions in the Pool School and soon you will be relaxing in a sparkling pool.
    Jason, TFP Moderator
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    JasonLion's Avatar
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    Re: Can't get FC up to appropriate level

    Welcome to TFP!

    I can tell you how to clean things up, but I'm not sure you are going to like it. Sadly, It is going to take quite a bit more chlorine, applied in a more focused way to clean things up. Shocking is an ongoing process, not something you can do in one step. You will need to add enough chlorine to bring the FC level up to shock level (24 if CYA is still 60), probably several times in a row at one hour intervals.

    Before you do that it would be best to double check some things and do some background reading. First, what kind of "shock" have you been using? It should have an ingredient listed on the package, or if you don't see that you can tell us the product name and we can probably look it up. I am concerned that you might have been using a product based on dichlor, while would have raised the CYA level and made things more difficult. I also suggest you do a little reading at Pool School, see the link near the top right of each page, especially the How To Shock You Pool article.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Can't get FC up to appropriate level

    Thanks for the advice.

    I have been using a dichlor. Power Powder Plus. I have used about 30lbs of it over last 5 days. I also have trichlor tabs in my feeder. I have feeder turned up to max.
    Michael, 35,000 Gallon, Inground, Vinyl Liner, Pentair CCP 520 Cartridge Filter

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    Mod Squad jblizzle's Avatar
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    Re: Can't get FC up to appropriate level

    uh-oh. That is what we were afraid of. I think that 30 lbs of dichlor also added about 50 ppm of CYA to your pool.

    Were your posted levels before or after you added all that? If well, before your test, you may be OK and it all may be registering. But, you should not add any more CYA until your pool is cleared up.

    The tabs you are using are also adding CYA, so you should stop using them too and start loading up on bleach and read Pool School!!!

    Edit: I see that you have recently added the dichlor, unfortunately that probably means that the 60 level is lower than reality as it takes a few days (week) for the CYA to show up in the test.
    Jason, TFP Moderator
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    JasonLion's Avatar
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    Re: Can't get FC up to appropriate level

    Leslie's Power Powder Plus is 73% cal-hypo, not dichlor. 30 lbs will have raised CH by 50, which isn't too bad.
    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

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    Re: Can't get FC up to appropriate level

    Just got my TF 100 today.
    Doing all the tests and posting the results is the next step....you'll get help from everyone here.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  10. Back To Top    #10

    Re: Can't get FC up to appropriate level

    Thanks for the information. It has been very educational and helpful. Will work on the shock and keep posting my results.
    Michael, 35,000 Gallon, Inground, Vinyl Liner, Pentair CCP 520 Cartridge Filter

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    dmanb2b's Avatar
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    Re: Can't get FC up to appropriate level

    Welcome to TFP

    Great move on the kit. Post up them results and plan on getting lots of liquid chlorine...may be a bit more expensive than bleach, but with a 35K gal pool, you may want to consider 2-3 5gal carboys of 12.5% chlorinating liquid (aka double strength bleach) from the pool store to start. 1Gal of 12% should raise your FC by approx 3.6ppm.

    http://www.poolcalculator.com is your friend in determining how much of a certain chemical you may need to adjust chemistry.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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    Re: Can't get FC up to appropriate level

    Took your advice and shocked the pool with 12 gallons of liquid chlorine 12.5% last night. Pool did finally turn blue but is still very cloudy, which I expected.

    Did also clean my cartridge filters as the pressure in the filter was building up. This was done before the shock treatment.

    Current readings are as follows:
    FC 4.0
    CC 1.0
    TC 5.0
    pH 7.3
    T/A 80
    CH 370
    CYA 70

    Still have my automatic feeder running wide open 24/7.

    Assuming that since water is still cloudy, I need to let dead algae continue to fall and then vaccum. Should I shock again?

    I appreciate the guidance on here as I am seeing progress which is something I can't say that I saw when getting help from the local pool store.

    Thanks.
    Michael, 35,000 Gallon, Inground, Vinyl Liner, Pentair CCP 520 Cartridge Filter

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    Re: Can't get FC up to appropriate level

    According to the CYA/Chlorine relationship chart, at 70ppm CYA, you need to be shocking at FC-28.

    It needs to hold there until the pool clears, the overnight FC loss is 0, and CC is less than 0.5.

    pool-school/chlorine_cya_chart_shock

    Read here for how to shock a pool and how to know when the process is complete.

    pool-school/shocking_your_pool

    Doug

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    Re: Can't get FC up to appropriate level

    It needs to hold there until the pool clears, the overnight FC loss is 0, and CC is less than 0.5.
    I am simply reinforcing what douglee25 wisely posted.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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  15. Back To Top    #15

    Re: Can't get FC up to appropriate level

    Thanks. Will get on shocking again tonight.
    Michael, 35,000 Gallon, Inground, Vinyl Liner, Pentair CCP 520 Cartridge Filter

  16. Back To Top    #16

    Re: Can't get FC up to appropriate level

    I want to thank those that posted. Pool is in great shape. Crystal clear and chemicals are spot on with the exception of chlorine level. Still high from shocking the pool, but it has been dropping and I expect we should be swimming this weekend. Thanks again for the advice.
    Michael, 35,000 Gallon, Inground, Vinyl Liner, Pentair CCP 520 Cartridge Filter

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    dmanb2b's Avatar
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    Re: Can't get FC up to appropriate level

    Glad we could help...enjoy the pool
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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