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Thread: Pool Opening in Illinois-New Test Kit Needed?

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    Pool Opening in Illinois-New Test Kit Needed?

    I have a TF-100 test kit that is going on its second season. I'm nearly out of CYA reagent and when I used it today it never registered any CYA at all. Seems strange given that I ended the season around 90 doesn't it? Is the reagent bad perhaps? While we're at it, do I need to replace all of the chemicals in the test kit? I still have quite a bit left to get me through this year. . .
    40,000 gallons (20' x 40'); IG; vinyl liner
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    northrn's Avatar
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    Re: Pool Opening in Illinois-New Test Kit Needed?

    As long as it was stored properly, it should be good. What are your other results?
    27' AG 18K Gallons ~ Cartridge Filter ~ Pentair 1.5 HP Pump

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    Mod Squad jblizzle's Avatar
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    Re: Pool Opening in Illinois-New Test Kit Needed?

    How was it stored? Should be fine. The CYA is the most stable reagent, so sounds like your CYA is now zero, could have been converted to ammonia.
    Jason, TFP Moderator
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    Re: Pool Opening in Illinois-New Test Kit Needed?

    Disappearing CYA (most always over the winter) is something that we seem to document more and more often on this forum. Not that the incidence has increased, we just weren't as aware of it as we are now. It also seemed to be related to pools that had gotten really dirty over the winter but I am less sure of that than I was a couple of years ago. What condition was your pool water in when you opened?

    I am pretty sure the reagent is good. It is really stable (as JB says) and not subject to degradation like some of the others are.

    Why was your CYA @ 90 last year?

    - - - Updated - - -

    Disappearing CYA (most always over the winter) is something that we seem to document more and more often on this forum. Not that the incidence has increased, we just weren't as aware of it as we are now. It also seemed to be related to pools that had gotten really dirty over the winter but I am less sure of that than I was a couple of years ago. What condition was your pool water in when you opened?

    I am pretty sure the reagent is good. It is really stable (as JB says) and not subject to degradation like some of the others are.

    Why was your CYA @ 90 last year?

    On 5/14/2014, you wrote....
    I removed approximately 50% of my pool water and replaced with well water (unfortunately). My new numbers are as follows:
    CYA=50
    TA=270
    PH=7.6
    CH=260
    TC and FC were at 0 but I've since begun...
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: Pool Opening in Illinois-New Test Kit Needed?

    Maybe this Ohio Ammonia monster isn't as bad as it seems because it is cheaper to cure than replacing your water to lower CYA. Get an Ammonia test kit at the pet store.
    20x40 30k gal vinyl, Inline Tri-Chlor Chlorinator, Hayward 250K btu heater, Hayward 2HP Super Pump, Hayward DE6020 Filter,

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    Re: Pool Opening in Illinois-New Test Kit Needed?

    good catch. my last CYA was 50, not 90. . . . My pool had a good amount of algae when I opened but I could see the bottom of a 9 foot deep end. I vacuumed to waste, added 1 quart of 50 algaecide and I'm going to vaccuum to filter and backwash tonight. My plan is then to shock with liquid chlorine. Should I first add stabilizer based on the fact that I'm at 0 based on the test? Can someone show me how I can calculate how much initial chlorine I will need in order to shock? Additional test data to come. . .
    40,000 gallons (20' x 40'); IG; vinyl liner
    sand filter
    BBB method for 2 full seasons
    tf100 test kit
    central Illinois

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    Mod Squad jblizzle's Avatar
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    Re: Pool Opening in Illinois-New Test Kit Needed?

    The algaecide is hardly ever recommended. It is more for prevention than for eradication. You need chlorine. It is cheaper and more effective.

    You need to start to learn to use PoolMath to calculate your dosages.
    Jason, TFP Moderator
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    Re: Pool Opening in Illinois-New Test Kit Needed?

    Chlorine levels are at 0
    TA-130
    PH-7.7
    CYA-0

    I vacuumed to waste, added 15 gallons of 10% bleach and algaecide. Krawler is doing its thing. What is ideal CYA and cheapest route to increase it? Everything else is good. I assume I need to do an overnight chlorine test asap?

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    Re: Pool Opening in Illinois-New Test Kit Needed?

    Start with a CYA of 30. Any product that is 100% (or as close as you can get to it) cyanuric acid is fine. I bought mine online from backyard pool superstore. Do a Google shopping search for it and plenty of options will show up.

    Since FC went to 0, I'd probably do an overnight test to be sure.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
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    Mod Squad pooldv's Avatar
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    Re: Pool Opening in Illinois-New Test Kit Needed?

    Please update your signature per this, What we need to know to answer your questions

    Here is some basic info on water chemistry, ABC's of Pool Water Chemistry

    Here are the Recommended Levels

    And here is PoolMath to calculate what to add and how much to achieve the recommended levels.

    I prefer to buy Kemtech Stabilizer from Lowes to increase my CYA. Put it in a sock and put it in your skimmer basket to dissolve. Give it a squeeze a few times a day to speed it along. Don't add too much at once, aim for the low end of the recommended range. It takes a week for CYA to fully dissolve and register on the test.
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    Re: Pool Opening in Illinois-New Test Kit Needed?

    You might want to put in 10ppm of FC, and then test the FC and CC in 30 minutes ... with the complete loss of CYA, could be ammonia and I think you want to deal with that before adding CYA.
    Jason, TFP Moderator
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    Re: Pool Opening in Illinois-New Test Kit Needed?

    Why have I never heard of needing to deal with ammonia before? I will look for a test kit at the pet store and test first but what if it turns out I have an issue?

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    Re: Pool Opening in Illinois-New Test Kit Needed?

    Add the 10 ppm of chlorine and test in 30 minutes. If the FC measures 0 in 30 minutes then there is a good chance that the CYA was converted into ammonia. Let us know what the results of this test is and we will go from there.

    You can do a search for ammonia and find some threads that have already been solved in the past.
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    Re: Pool Opening in Illinois-New Test Kit Needed?

    FC dropped to around 3ppm after 1 hour (I forgot to check it) and I still had some left from the night before (from about 10ppm to 0.5). So, this means ammonia is not an issue? But I do need to add CYA since it's at 0. Is it advisable to do that while I'm SLAMing? I've already started the SLAM process of keeping the pool at 10ppm until I can pass the overnight (won't be for a bit I'm guessing based on what condition my pool was in to start this year).
    40,000 gallons (20' x 40'); IG; vinyl liner
    sand filter
    BBB method for 2 full seasons
    tf100 test kit
    central Illinois

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    Mod Squad jblizzle's Avatar
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    Re: Pool Opening in Illinois-New Test Kit Needed?

    What was the CC? That is a pretty big FC drop for an hour. Was the sun on the water during that time?
    Jason, TFP Moderator
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    Re: Pool Opening in Illinois-New Test Kit Needed?

    0.5 cc

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    Re: Pool Opening in Illinois-New Test Kit Needed?

    Sorry 6.5cc

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    Re: Pool Opening in Illinois-New Test Kit Needed?

    I would say this is a case of the CYA being converted into ammonia and you have to get rid of it with chlorine. Since you have a vinyl liner you can do a partial water changes if there is a lot of ammonia that needs to be broken down. Replacing the water might be the cheapest option for you. First, get an ammonia test kit from a fish store and post the results of that test.

    Read this thread to get more information, http://www.troublefreepool.com/threa...CYA-gt-Ammonia.

    Some of the chem guys might be able to better offer how much chlorine it will take to clear up the pool when we see the ammonia test results.
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