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Thread: TF100 vs Pool Store

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    TF100 vs Pool Store

    I used my TF100 test kit for the first time the other day, and then took a sample to the pool store for some type of sanity check. My results are below and as you can see, there is a problem with (at least) the calcium hardness number when I did the test. Not sure what I did or how I arrived at this number. Here are my results:


    ........ TF100 .........Pool Store
    FC ---- .14 ---------- 0.5
    CC ----- None -------- -
    TC------ .14 -------- -
    pH ------ 7.8--------- 7.8
    CH-------.1 ------------250
    CYA------65-----------55-60

    My salt reading is 3.2 and the SWG is set to 50%.

    From my newbie analysis, it seems like my chlorine level is too low on either test and my CYA is too low too. Also, do I need to bring the calcium hardness level up a bit?

    Is my chlorine level too low? If so, how should I raise it? Should I shock the pool with bleach or just bump up the SWG setting? Also, if my CYA needs to go up to 70-80, how much should I add?
    700 sq. ft./30,000 gal, gunite pool; 48 SF DE filter; 1.5 HP pump; Salt Water Generator; Solar Heat

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    Mod Squad Bama Rambler's Avatar
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    Re: TF100 vs Pool Store

    There are a couple of numbers that don't make sense. If you have the columns correct, Your's first then the PS next.
    You shouldn't be able to get .14 with the TF-100. I suspect you have them reversed. You also can't get a CH number of .1

    Let us know if the columns are correct and we'll go from there.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: TF100 vs Pool Store

    I'd go ahead and run the FC test and the CH tests again. When done correctly the FC test is going to be accurate only to a ".5" number - so .14 isn't possible. For example if the pink clears in 7 drops you divide 7 by 2 = 3.5ppm FC

    Same with the CH test - the closest number will be a multiple of 10 - as each drop counts as 10 points. So 10 drops till color change = 100ppm CH
    16K Gal Plaster | Compupool SWG | Intelliflow VF | TF-100

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    Re: TF100 vs Pool Store

    Thanks folks!

    Yes, the columns are correct (or at least as I intended them to be). My reading is first, the pool store's is second.

    I don't know what I did to get those numbers. If I remember correctly the FC number was based on 2 drops times 7, which equals .14. But I might be mixing the memories of 2 different tests. Speaking of the tests, one of them had me add drops until the water turned red. I was swhishing the tube around to try to mix the water after every drop. Is that the correct way to do it?

    Back to the chlorine number, assuming the pool store is correct, what's the best way to get it up to a more acceptable level?

    Thanks again,
    Bart
    700 sq. ft./30,000 gal, gunite pool; 48 SF DE filter; 1.5 HP pump; Salt Water Generator; Solar Heat

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    Mod Squad Bama Rambler's Avatar
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    Re: TF100 vs Pool Store

    You should run the tests again.
    2 drops x .5 = 1ppm FC
    Each drop on the CH test = 10 ppm.

    Swirling while dropping is the preferred way to do the tests.

    The best way to get your FC up is bleach. The Pool Calc will help you figure out how much you need.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: TF100 vs Pool Store

    If you were using the 25 mL sample size on the FC test, and needed 7 drops to turn it clear, that would be 7*0.2=1.4 ppm FC.
    20k gallon IGP
    Plaster over gunite
    3/4 hp Hayward pump
    Purex Triton DE filter
    TF100 test kit w/ speedstir

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    Re: TF100 vs Pool Store

    Thanks again folks!!

    Regarding the low free chlorine numbers and getting them up, once I figure out how much bleach to add, will that amount be "self sustaining" with the SWG? In other words, will I have to keep adding bleach or am I just trying to get it up to the proper level and then let the SWG take over in producing the chlorine?
    700 sq. ft./30,000 gal, gunite pool; 48 SF DE filter; 1.5 HP pump; Salt Water Generator; Solar Heat

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    Re: TF100 vs Pool Store

    It should keep it correct, but you may need to work with it for a while to get it fine tuned. I have a question about your salt reading though, you shouldn't have a reading of 3.2, it should be in the thousands, like 3200. Have you added salt to the pool?

    Also, you don't shock by cranking up your cell. You should use bleach to shock.
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
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    Re: TF100 vs Pool Store

    Robbie -
    The SWG reads "3.2" but the actual number is 3200.....the display is not large enough to show all the numbers. Yes, I did add salt (well the pool guys did when they opened the pool this spring). The salt level was 2800 a few weeks ago and I added 80 more pounds of salt to bring it up to 3200.

    Thanks for the info on the shock too!
    700 sq. ft./30,000 gal, gunite pool; 48 SF DE filter; 1.5 HP pump; Salt Water Generator; Solar Heat

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    Re: TF100 vs Pool Store

    3.2 gpl = 3200 ppm
    A salt level of 3.2 is grams per liter
    3200 is parts per million
    Which salt system?
    poolschoolgrad

    20x40 free-form IG vinyl, 1hp Hayward superpump, Hayward pro grid DE filter, Raypak heatpump, Goldline Aquarite SWCG, Polaris 280 with booster, and tested using a Taylor K2006.

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    Re: TF100 vs Pool Store

    It's an AquaPure. Not sure the model number but it was only installed last fall.
    700 sq. ft./30,000 gal, gunite pool; 48 SF DE filter; 1.5 HP pump; Salt Water Generator; Solar Heat

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