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Thread: First Testing - Need feedback

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    First Testing - Need feedback

    Got the water tested at Leslie's and tested it myself for the first time using a TF-100 as well.
    Leslie's results
    FC - 6
    TC - 6
    CH - 300
    CYA - 125
    TA - 220
    pH - 7.6
    TDS - 2600
    Pho - 1000

    They recommended draining the pool. When we didn't want to do that, they recommended using muriatic acid to lower pH as an immediate next step but mentioned that there is not much that can be done without draining. So, today after 1 gallon of muriatic acid in the pool and using my kit, here are my results:
    pH - 7.2
    Cl > 5
    FC - 25
    CC - 0
    TC - 25
    TA - 210
    CH - 650
    CYA > 100

    Free Chlorine and Calcium Hardness are way off from Leslie's tests - not sure which ones are accurate (there could definitely be beginner's error in my tests!)
    We've been using the pool with no complaints - water is clear, no algae, no skin/eye irritation. As I mentioned before, I've used 1 gallon of muriatic acid and I removed the floater with the chlorine pucks.
    Anyway, bigger question is what can I do to balance the water?
    -- IG Plaster pool with spa, estimated 23K gal,
    -- Hayward Pro-Grid DE filter
    -- Pentair Intelliflo variable speed pool pump
    -- Pentair Great White gw9500 pool cleaner

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    Re: First Testing - Need feedback

    If leslies said your cya is 125 and your test shows > 100 ppm, it could be any number even as much as 350 or possibly even higher. Hard to say without a dilution cya test (very possibly diluted multiple times to get a reading below 90.) See the extended test kit directions: http://www.troublefreepool.com/threa...Kit-Directions
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    Richard320's Avatar
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    Re: First Testing - Need feedback

    How did the FC get so high? Are you, by chance, using the 25 ml sample and multiplying by the 10 ml factor?

    The CYA needs to be checked again as mentioned above.

    If the FC is really that high, I'd suspect your pH was fine, and is now dangerously low. The pH reagent reacts with high FC levels and reads artificially high. http://www.troublefreepool.com/threa...els-with-R-007
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
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    Re: First Testing - Need feedback

    Welcome to the forum

    Not sure what their rush in dropping the pH was as 7.6 isn't bad. I prefer 7.2-7.4 but everyone has what they think is best for them. It wouldn't be an emergency until you peg the test at it's upper limit of 8.2 THEN it's important to drop it down as 8.2 is telling you it might be worse 8.6, 8.9 or 9 something but it doesn't go that high. If you get up to 7.8 under normal conditions you'd want to bump it down some as the normal range is 7.2-7.8 with owners picking their best range usually within those limits.

    You do need to do a dilution test on that CYA to get a solid number on where you are at.

    Let us know if possibly there was a mistake in how you did that FC test - - > https://www.youtube.com/watch?v=PHQG...9Y_YYNAeLtUr1g

    Other helpful how to testing videos - - > https://www.youtube.com/user/tf100te...e=results_main
    '70s IG Vinyl 32K gal, Lazy L, Hayward SuperPump 1.5hp 120V, S240 Sand Filter W/DE
    Solar Blanket, Well Water, Borax Added, TF-100 tester. ? too cold
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    Re: First Testing - Need feedback

    I went back to Leslie's and here are the numbers from today's test
    FC - 8
    TC - 8
    CYA - 140
    TA - 140
    pH - 7.4
    TDS - 3700
    Pho - 300
    Again they recommended to drain the pool at least 1/2 way to get the CYA under control.
    -- IG Plaster pool with spa, estimated 23K gal,
    -- Hayward Pro-Grid DE filter
    -- Pentair Intelliflo variable speed pool pump
    -- Pentair Great White gw9500 pool cleaner

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    Re: First Testing - Need feedback

    I would run the CYA test as described above before taking drastic action. The pool stores are notorious for not getting the CYA test right. You need to have a good idea of where you are before you drain. But, if your CYA is at 100-140, you do need to drain at least half your pool.
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    Re: First Testing - Need feedback

    Since you have a top quality test kit, don't bother with Leslie's testing, it will only confuse you.

    Have you tried to do the CYA test with dilution?

    With your test value for CYA and Leslie's test confirming high CYA you will need to drain some of the pool water. We can not give you an answer to how much to drain until you do the dilution test as the test only goes up to 100 and any number above 100 is just a guess with either your test or Leslie's test.

    Make sure you are following the directions for the amount of water to use when testing the FC. I like to use 10ml of water and each drop of reagent counts as .5 ppm of FC.

    Try reading, ABC's of Pool Water Chemistry to get more of an understanding of how the chemicals effect the pool water.
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    Re: First Testing - Need feedback

    Quote Originally Posted by ping View Post
    With your test value for CYA and Leslie's test confirming high CYA you will need to drain some of the pool water.
    I would call that an understatement to say the least. If you had a CYA level of 100 you should remove around 60% depending your location. You don't have a location in your profile so if you are up north you might shoot for CYA 30 and you'd need to dump out 70% or Texas and want CYA 50 and then only half the water would need to go.
    If that 140 is correct you'd need to dump 70% to get down to something reasonable like 40. And that would be if you actually did a one for one drain and fill. If you drain at the same time as fill it will take longer and use more water.

    Use the 10ml test tube to take 10ml of pool water and 10ml of distilled water, mix in a bigger container and then pour 10ml of it back into the 10ml tube to test. Now you just double your results and it gives you a firm believable CYA level to work from.
    '70s IG Vinyl 32K gal, Lazy L, Hayward SuperPump 1.5hp 120V, S240 Sand Filter W/DE
    Solar Blanket, Well Water, Borax Added, TF-100 tester. ? too cold
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    Re: First Testing - Need feedback

    I used the extended test instructions and my CYA reading was 200!! I tested it several times and it was consistently 200 - probably got 180 once. However, I used tap water instead of distilled water as the instructions mentioned. (I see kiss4afrog has mentioned distilled water). Should I retry with distilled water?

    I also retested FC and it came up 22. 44 drops * .5 before the pink turned clear. Watched the video and I was doing it right.

    I used the CYA numbers in the PoolMath and it came up with an 80% drain for my approx 23,600 gallon pool
    -- IG Plaster pool with spa, estimated 23K gal,
    -- Hayward Pro-Grid DE filter
    -- Pentair Intelliflo variable speed pool pump
    -- Pentair Great White gw9500 pool cleaner

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    Richard320's Avatar
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    Re: First Testing - Need feedback

    Tap water is okay for the CYA test. It has no CYA in it.

    You still haven't explained how and why the FC is so high. But your pH test is probably wrong.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: First Testing - Need feedback

    If you know the water table and the pool is safe to drain all the way I would go ahead and drain 90-100% of the water or else you will be fighting this endlessly. Once the drain and fill are complete post the test results and we can guide you from then on. Search on how to do an OCLT, overnight chlorine loss test, as this will determine if you will need to SLAM the pool after the fill.

    If you drain 100% you will need to add 5 lbs of CYA, about $25ish, but you will know what the CYA level will be from the start. The dilution method is a very rough guess in your case and the CYA level might still be a lot higher than your number. Myself, I would drain it all and start over.
    16k gal plaster with raised spa, Jandy DEV60 filter, 2 HP 2-speed SHPF Jandy Stealth pump
    Hayward Aqua Rite T-15 SWCG, Jandy LXi 400k BTU NG heater, 350 sq.ft. of Sun Star solar panels, TF-100 Test Kit, Dolphin s300i Cleaner
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    Kiss4aFrog's Avatar
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    Re: First Testing - Need feedback

    I wish I had something brilliant to say about what you can do but it's either dump almost all the water or if it's available in your area have a reverse osmosis treatment. http://poolservicestech.com/testimonials/
    I'm not recommending that company, no idea about them just posting the link to give an idea of what RO is about.
    You just need to choose the least painful way of doing it and then move on.

    Distilled water is just a "cleaner" source. For other tests it would be important as tap water does have a CH value, pH value, ... that would need to be added to the calculations and may have metals that might interfere with some tests. For CYA the tap water is OK.

    Instructions on the OCLT http://www.troublefreepool.com/conte...loss-test-oclt

    With FC above 10-15ppm the pH test is unreliable so it's not worth doing or reporting and you do NOT want to use it to make adjustments until you drop the FC down to or under 10ppm.
    '70s IG Vinyl 32K gal, Lazy L, Hayward SuperPump 1.5hp 120V, S240 Sand Filter W/DE
    Solar Blanket, Well Water, Borax Added, TF-100 tester. ? too cold
    1979, 275gal Conway Emerald Spa P-100-2, ES-2 Spa Pack, bromine floater, indoor
    TF-100, Best test kit - TFTestkits.net
    Please help keep the lights on, become a TFP Supporter!

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