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Thread: Strips say FC very low and almost no CYA

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    Strips say FC very low and almost no CYA

    Ok, my kit is ordered, and I thought it was going to arrive today, but it's not coming til tomorrow now. I have an algae issue; not gross disgusting yet, but I'm afraid that's where I headed. My stips are saying
    FC .5
    pH 7.2
    TA 80
    CYA 0

    Do I hold off another day to do anything so I can use the pool calc or do I just use those numbers and ge to work? I don't want to make my situation worse...
    Christina
    40x22, 25,000 gallons; vinyl; DE filter

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    Re: Strips say FC very low and almost no CYA

    yeah. i would wait another day. in the meantime you could vacume your pool surfaces and then brush the walls so you can save some time tommorow!
    24' X 52" round above ground pool---13,500 gallons---Hayward power flow matrix 1.5 hp pump---Hayward 21 in. variflow XL sandfilter---Louisville, Ky

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    Re: Strips say FC very low and almost no CYA

    I would add a big jug of clorox and brush and circulate. The strips are not accurate, but they are somewhat good. CYA = 0 on a strip may mean that CYA = 20 on a better test.

    In any case, FC = 0.5 is very low. You may need FC = 10 to shock at CYA = 0 or FC = 12 to shock at CYA = 20. But adding a jug and a half of bleach to get to 3 may slow the algae growth down somewhat.

    Probably best to wait for someone to confirm that, we don't want to damage the liner by too high chlorine. In the meanwhile, you can shopa around for chlorine and stock up. Check prices at Walmart, Sams Club and similar, and the local grocery, as well as liquid chlorine from the pool store and the prices for dichlor and stabelizer/conditioner in those same places.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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    Mod Squad woodyp's Avatar
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    Re: Strips say FC very low and almost no CYA

    I'd dang sure take the FC to 10 or 12 and run that pump continuously, It ain't gonna do anything but get worse if you wait. You don't need a test kit to tell you that. Watch your pressure and backwash if needed. Good luck.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
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    dmanb2b's Avatar
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    Re: Strips say FC very low and almost no CYA

    Quote Originally Posted by woodyp
    I'd dang sure take the FC to 10 or 12 and run that pump continuously, It ain't gonna do anything but get worse if you wait. You don't need a test kit to tell you that. Watch your pressure and backwash if needed. Good luck.
    Honestly...to avoid wasting bleach...who knows what's going on with the pool ...without a good test kit, it would be difficult to maintain an FC of 10-12 with no CYA...between the algae and lack of CYA, the OP will just burn through chlorine and may not make any progress. The reason you need the kit is that once you are at shock level...you have to hold it there until you are done shocking.
    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: Strips say FC very low and almost no CYA

    Quote Originally Posted by dmanb2b
    Quote Originally Posted by woodyp
    I'd dang sure take the FC to 10 or 12 and run that pump continuously, It ain't gonna do anything but get worse if you wait. You don't need a test kit to tell you that. Watch your pressure and backwash if needed. Good luck.
    Honestly...to avoid wasting bleach...who knows what's going on with the pool ...without a good test kit, it would be difficult to maintain an FC of 10-12 with no CYA...between the algae and lack of CYA, the OP will just burn through chlorine and may not make any progress. The reason you need the kit is that once you are at shock level...you have to hold it there until you are done shocking.
    Well, I always defer to those who are moderators and/or have thousands of posts.... so I retract my advice.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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    dmanb2b's Avatar
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    Re: Strips say FC very low and almost no CYA

    Just because we're mods...doesn't mean we're always right Had the OP not stated anything about getting a kit tomorrow, not a bad idea to just keep adding bleach, by just my opinion...the OP will have greater control over the issue with the kit rather than maybe not adding enough to help the issue or potentially adding to much

    My suggestion...read pool shool, especially Defeating Algae

    and How to Shock Your 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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    Re: Strips say FC very low and almost no CYA

    Thanks, everyone. I'm going to hold off on bleach til tomorrow--hoping the kit gets here early so I can get to store and add what I need, but I am going to keep the filter on all night. I figure that can't hurt... Have read both articles, but am going back for another read right now. I'll probably reread AGAIN tomorrow once I have my numbers so I can be super sure I know what I'm doing. Ugh, can't WAIT to have this straightened out!!!
    Christina
    40x22, 25,000 gallons; vinyl; DE filter

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    Re: Strips say FC very low and almost no CYA

    Shoot--Now I have another question: if when I get my kit, I find my CYA really is 0, can I add stabilizer and shock it at the same time? Or do I need to up the CYA first? Or do I shock for 0 CYA??? I am sorry to ask questions that are probably answered somewhere (and for feeling so ignorant).
    Christina
    40x22, 25,000 gallons; vinyl; DE filter

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    Re: Strips say FC very low and almost no CYA

    If you are adding a shock product it will most likely contain CYA read the label for chlorinated isocyanurates. Remember Pool School, Shocking is a process not a product. How do you normally chlorinate your pool. If its with tablets then you may already have enough CYA, wait for the test kit or use Bleach.

    Recently I tested 3 pools for CYA which tested at 140-190ppm and the test strips from 3 different well known makes showed 20-30 and 0 ppm. Test strips for CYA are a total waste of time IMO.

    Running the pump is a good idea, stationary water goes green quicker.

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    JasonLion's Avatar
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    Re: Strips say FC very low and almost no CYA

    If CYA starts at zero, it is best to add 20 or 30 ppm of CYA, wait 24 hours and then start shocking.
    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: Strips say FC very low and almost no CYA

    Ok, so here are the real numbers as per the kit.
    FC 0
    CC .5
    TC .5
    pH 7.5
    T/A 130
    CH 290
    CYA 0 (tested 2x just to be sure I did it right)
    Temp 74

    When I use the pool calc it says 100 oz stabilizer and 4 gal bleach. So I'll add the stabilizer tonight and wait til tomorrow night for bleach? Is there any particular way to add the stabilizer? Going to pool school right now to look, but if someone sees this, I'd love the help... Thanks!
    Christina
    40x22, 25,000 gallons; vinyl; DE filter

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    Re: Strips say FC very low and almost no CYA

    i poured mine straight in. some say u can put it in some pantyhoes and set iy in the skimmer. if you do it that way u cant backwash for like a week b/c some might be in the filter. i would go ahead and put the bleach in now as well there no reason not to..... its ok to put both in at the same time!!
    24' X 52" round above ground pool---13,500 gallons---Hayward power flow matrix 1.5 hp pump---Hayward 21 in. variflow XL sandfilter---Louisville, Ky

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    Re: Strips say FC very low and almost no CYA

    I was under the impression that if you put the CYA directly into the skimmer then you had to wait a week to backwash or risk losing some of the CYA. If, however, you use the pantyhose trick it doesn't matter because the CYA will be dissolved in the skimmer and passed through the filter. Not sure on this as I am a newbie as well so wait for a senior person to clarify this. I can tell you this though, the CYA I put in a skimmer sock earlier today dissolved surprisingly fast. I will be using this method from now on even though it might mean I have to wait in between backwash cycles.
    18'x24' (10,000 gal) above ground pool, 19" Proline sand filter (45 GPM), Jacuzzi 1.5 HP 2 speed pump

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    frustratedpoolmom's Avatar
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    Re: Strips say FC very low and almost no CYA

    Don't retest for the CYA level for 5-7 days. It can take that long to fully dissolve and register on the tests. You'll just waste reagent if you test sooner. Assume that your targeted amount is your new level, and use the corresponding FC levels from the chart, and start shocking.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
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    Re: Strips say FC very low and almost no CYA

    Quote Originally Posted by frustratedpoolmom
    Don't retest for the CYA level for 5-7 days. It can take that long to fully dissolve and register on the tests. You'll just waste reagent if you test sooner. Assume that your targeted amount is your new level, and use the corresponding FC levels from the chart, and start shocking.
    Good- this is what I did. (First smart thing I've done with this pool. Wait no, second. Finding this site was first.) Level dropped from 15 first night to 11ppm in the AM, returned back to 15. We are at the start of a heat wave now and I was down to 3.5 this evening when I checked. Do I go back up to 10 and see if I can get it to hold for the night? That's what I'm thinking, so I hope I am right....
    Christina
    40x22, 25,000 gallons; vinyl; DE filter

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    Re: Strips say FC very low and almost no CYA

    One other thing: I brushed walls and bottom where it was green, and NOTHING is coming off. Could I have a stain instead of an algae issue? It's not getting any worse, but it also hasn't gotten any better either...
    Christina
    40x22, 25,000 gallons; vinyl; DE filter

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    frustratedpoolmom's Avatar
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    Re: Strips say FC very low and almost no CYA

    Since you added stabilizer, enough to reach 30, your shock level is 12. So you need to use 12 as your target for shocking and hold it there until it holds overnight.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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