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Thread: Always getting low FC

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    Always getting low FC

    My pool is crystal clear, been testing my water weekly and it always seems that my FC is very low

    My reading today is as follow

    Temp 61 degrees
    FC = 0 or maybe .5 ish the color of the test is very faint so it's hard to tell
    PH. = 8.2
    TA = 100
    CYA = 40

    All appears to be in range but my FC. Since we won't start using the pool for at least another 6 weeks and even during the winter, should we be concern if FC is low?

    2 or 3 weeks, when I shock the pool FC should rise right?
    SF Bay

    ********20,000 gallon IG Fiberglass, DE Filter, Hayward Max-Flo VS, Taylor TF-100 Test, Circupool RJ-45********

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    Richard320's Avatar
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    Re: Always getting low FC

    If the water is 61 now and you expect it to warm up, you need to start paying attention to the chlorine level. If you don't get algae, it's really easy to keep it away. Do something with your pH, too. If it reads 8.2, you might be even higher than that.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Mod Squad pooldv's Avatar
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    Re: Always getting low FC

    Yes, you need to maintain FC based on cya chart or higher, I keep mine at 10ish during winter. Temps are rising algae will start to grow if you do not maintain FC. Clear water is good, but algae can get hold while water is clear and by the time it gets cloudy you are already in trouble. No shocking needed if you keep it under control. I have never shocked my pool, coming up on season four. And ph needs to be lower.
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    JasonLion's Avatar
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    Re: Always getting low FC

    Get the PH back into range before worrying to much about the FC level.

    Also, if CC is well above 0 and FC is down around 0 there might be something more complex going on.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Always getting low FC

    Quote Originally Posted by JasonLion View Post
    Get the PH back into range before worrying to much about the FC level.

    Also, if CC is well above 0 and FC is down around 0 there might be something more complex going on.
    As the matter of fact, my PH has not been in range since I cleared the pool last month from algae.

    Would doing a 50% water change at this point be too extreme before trying more chemicals?

    3 weeks ago when my Ph was in check my chlorine was only at 1.
    SF Bay

    ********20,000 gallon IG Fiberglass, DE Filter, Hayward Max-Flo VS, Taylor TF-100 Test, Circupool RJ-45********

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    Re: Always getting low FC

    Forgive my ignorance, but I'm a little confused about how you're getting your chlorine into the water. Do you have a salt water generator, or do you manually add chlorine (eg. Liquid chlorine)? Do you mean its being used up faster than you're adding it?/Faster than what's "normal" for your pool?

    I'm unclear why you'd want to do a water change instead of just adding more chlorine to avoid getting algae and keeping the water sanitized an pathogen-free. (Isn't SF having water supply troubles?) Your comment about "before adding more chemicals" is what's puzzling...if you change the water you'd still have to chlorinate it, and constantly, to maintain it. So balancing your water/sanitizing with chlorine is not really characterized as an unnecessary use of chemicals...its maintenance

    Have you read through "Pool School" to get the gist of maintaining your water the TFP way? That would assist you, I believe. If you have an swg and its not keeping up, a SLAM may be in order if your water/weather is warmer. Either way, riding such a low FC is kind of asking for trouble if the water's warm enough for algae, which clearly it is since you had algae last month.
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    Re: Always getting low FC

    First, like Jason said, get the pH in line with some acid.

    Second, what test kit are you using? Color match leaves me to believe you are using an OTO test. Because of the difficulty of matching colors I just use the FAS-DPD test.

    I see nothing in your numbers that would sugges that you should exchange some of that precious CA water, unless the CH is through the roof.
    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: Always getting low FC

    I don't see anything that would warrant water replacement.

    PH can be lowered fairly easily with acid. You should be testing and adjusting the PH weekly (unless the water is very cold, then monthly). Try to keep the PH so it never goes above 8.0.
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    Re: Always getting low FC

    Are you afraid of using acid?
    I'd bet you my bikini you'll never get TFP water from a pool store!

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    Re: Always getting low FC

    Sorry guys, I was reading/watching about CYA levels and somewhere someone said you can't lower CYA with chemicals and the only way to do it is with a water change and I put CYA + FC kind of goes hand and hand and ended up with TMI then brain farted. LOL

    I'll go pick up some Muratic Acid today and dump it in the pool.

    So my first goal now is to bring PH down to 7.2? How soon after I dump the MA in before I can test water again.
    SF Bay

    ********20,000 gallon IG Fiberglass, DE Filter, Hayward Max-Flo VS, Taylor TF-100 Test, Circupool RJ-45********

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    Mod Squad tim5055's Avatar
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    Re: Always getting low FC

    Give it at least 30 minutes with the pump running before you test again.
    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: Always getting low FC

    At this level of FC should I be using household bleach to raise FC or is there a better stronger method once I balance my ph
    SF Bay

    ********20,000 gallon IG Fiberglass, DE Filter, Hayward Max-Flo VS, Taylor TF-100 Test, Circupool RJ-45********

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    Re: Always getting low FC

    30 min stir and then re-test.
    Yes liquid bleach. There is stronger liquid bleach that's 12.5% that can be had at some pool stores or big box stores. I get mine at Fleet Farm but that's kind of local.
    It says shock but it's just strong liquid bleach, no CYA added.
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    Re: Always getting low FC

    The only thing that are available near by me are these two...

    kt ma.jpgkt.jpg

    Reviews aren't very good on those anyone use them?
    SF Bay

    ********20,000 gallon IG Fiberglass, DE Filter, Hayward Max-Flo VS, Taylor TF-100 Test, Circupool RJ-45********

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    Re: Always getting low FC

    Quote Originally Posted by dannieboiz View Post
    The only thing that are available near by me are these two...

    kt ma.jpgkt.jpg

    Reviews aren't very good on those anyone use them?
    The muriatic acid is half strength stuff, that's probably why it had bad reviews. The kemtek bleach says 10-11% on the msds. Nothing wrong with that. Depends on price and age. The bad reviews may have been due to old product. You can find full strength acid at hardware stores for $6-8 a gallon usually.


    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: Always getting low FC

    I've looked at osh, ace, lowes and homedepot sites and none of them have any full strength stuff. Leslie Pool doesn't even either
    SF Bay

    ********20,000 gallon IG Fiberglass, DE Filter, Hayward Max-Flo VS, Taylor TF-100 Test, Circupool RJ-45********

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    n240sxguy's Avatar
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    Re: Always getting low FC

    Quote Originally Posted by dannieboiz View Post
    I've looked at osh, ace, lowes and homedepot sites and none of them have any full strength stuff. Leslie Pool doesn't even either
    http://m.homedepot.com/p/Smart-2x1-G...-HD/100119310/
    http://m.acehardware.com/product/ind...uctId=53177236

    The one at ace is the same kind my local hardware store carries. Lowes website only shows the half strength stuff.


    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: Always getting low FC

    You don't necessarily need "full strength" stuff. What you want (or at least I do) is cheapest per oz.

    If half strength is less than half cost it's cheaper and it's what I'd buy it. With bleach there is just too much to figure out so I use the calculator : http://poncatechsquad.com/Dan/Chlorine/
    It will tell me what I'm actually paying per oz for the bleach and takes into account the strength, volume and price. That way you can do apples to apples no matter what. For bleach I usually get the Four bottles (gal sz) that's 12.5% for 9.99 (last year). All things considered it's the best buy or me but there are coupons you can use at walmart and sales in the paper that can make it smarter to shop someplace else. It also depends on how far I have to drive to get the "deal".

    All last year I was getting acid at Menards. Strong, cheap and convenient for me. http://www.menards.com/main/paint/cl...06-c-14360.htm
    '70s IG Vinyl 32K gal, Lazy L, Hayward SuperPump 1.5hp 120V, S240 Sand Filter W/DE
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  19. Back To Top    #19

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    Re: Always getting low FC

    strange my local HD doesn't but I called Ace and they have it.

    Any suggestions on Chlorine?
    SF Bay

    ********20,000 gallon IG Fiberglass, DE Filter, Hayward Max-Flo VS, Taylor TF-100 Test, Circupool RJ-45********

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    Re: Always getting low FC

    I would call around on the chlorine. I need to do that myself. Cheapest I found last year, without doing extensive searching, was 8.25% for $2.98 at Walmart. I need to find that 12.5% for $9.99 that kiss4afrog got. That's a great deal. If I have that readily available, I may use bleach instead of buying a new SWG.


    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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