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Thread: Trouble understanding FC test result

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    Trouble understanding FC test result

    Hi I just recently bought a Taylor k-2006 test kit.

    My pool looks great but I'm just trying to get my numbers and understand how much chlorine I need to add to my pool to keep it healthy.

    Every time I do the FC test I get confusing results and I just think I'm doing something wrong. For example:

    I do the 10ml setting
    I add 2 scoops of the R-0870 powder and swirl until it's bright pink.
    Then I add a drop and swirl of R-0871 and repeat this until it's clear
    I then multiply that number (in todays case it was 14 drops) by .5

    and I get 7

    what does 7 mean? is that a correct number? am I doing this right?

    sorry....I'm a noob.
    10,000 Gallon In-ground pool.

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    Mod Squad jblizzle's Avatar
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    Re: Trouble understanding FC test result

    14 drops = 7ppm (parts per million) ... which is certainly in the range of an acceptable number.

    We would need to know your CYA level to know what you should be maintaining the FC level at: FC/CYA Chart
    Jason, TFP Moderator
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    Re: Trouble understanding FC test result

    My CYA was 50.

    I suppose my confusion is because the Taylor manual says the ideal range is from 2.0-4.0 with a max of 5.0.

    Does that mean I'm way over?
    10,000 Gallon In-ground pool.

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    Mod Squad jblizzle's Avatar
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    Re: Trouble understanding FC test result

    Forget everything that pool stores or pool products are telling you. They do not understand the CYA/FC relationship and their recommendations assume 0ppm CYA ... pretty sad since the info has been available since the 70s.

    According to the chart, with 50ppm CYA, the minimum you should EVER let the FC get is 4ppm ... which means everyday you should boost it up to 6-7ppm to be sure it does not drop below 4ppm.

    BTW, it is safe to swim up to SLAM level which is a FC of 20ppm for you ... and even that high, the active chlorine level is still LOWER than you would find in an unstabilized public pool.
    Jason, TFP Moderator
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    Re: Trouble understanding FC test result

    Forget everything they told me. Ugh that is a pain But the reason I got into this mess was because of a pool store to begin with. We have a 9,000 gallon pool that used to have a SWG cell but it broke and instead of fixing it they suggested we could do a cheaper option and use CC tablets with CYA in our pool once a week and shock it once a week as well. I'm not sure how it happened but our CYA got up to 150ppm and we had a massive algae bloom and it was a total pain to get rid of. I decided from then on to take things into my own hands and get a kit.

    I slammed the pool for 4 days and filtered out all the algae and things are looking great. I just don't want to go down that road again.

    I guess my next step is figuring out when to add chlorine and whether or not I should use tablets or switch to liquid stabilizer.

    BTW, thanks for all your help.
    10,000 Gallon In-ground pool.

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    Re: Trouble understanding FC test result

    Do not use anymore tablets, use bleach/liquid chlorine to maintain your FC. You do not need liquid stabilizer (or any more trichlor tablets) since your cya is already high enough at 50 ppm...by the way how did you test for cya and have you added any tablets since you got that result?
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: Trouble understanding FC test result

    Those 2-4 ppm FC levels are the same levels they were suggesting 40-50 years ago, and seem to have been based on chlorine levels used prior to the introduction of CYA stabilizer in the late 1950's , when no one fully understood the effects CYA has on active chlorine levels. We now know a lot more about the buffering effects of CYA and it is slowly working its way into industry methods. Even though the buffering effects of CYA were first reported in studies decades ago, the whole concept has been lost on the pool industry until the last few years, in fact while the FC/CYA relationship has been featured online for over a decade, it has only been in the last couple of years that some of the major industry groups have started to accept some of these concepts.
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    Re: Trouble understanding FC test result

    I tested for that result by using the test kit.

    7ml water and 7ml of R-0013 then pour it into the canister until you can't see the black dot. There is a tablet in the pool now but I will go and remove it
    10,000 Gallon In-ground pool.

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    Re: Trouble understanding FC test result

    Quote Originally Posted by aonis
    I tested for that result by using the test kit.

    7ml water and 7ml of R-0013 then pour it into the canister until you can't see the black dot.
    Great, just wanted to check to make sure we had a reliable measurement to go by.

    Quote Originally Posted by aonis
    There is a tablet in the pool now but I will go and remove it
    Have you added just this one puck since you did the cya test, or have there been more, and if yes, how many?
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: Trouble understanding FC test result

    Your CYA test result is good and go by that.

    Pool stores like to make money. Their method of pool care lends to spending lots of money in their stores and as you found out, a pool that is out of balance.

    TFP's method is to maintain your pool based on proven science that you only add the chemicals that you know your pool needs by the testing you do. Most of the chemicals can be bought at stores that do not cater to pools thus saving you money.

    Read up in Pool School, top right button on each page, and be enlightened.
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    Re: Trouble understanding FC test result

    linen

    The puck has been in for about 4 days, and I took the CYA measurement this afternoon. So hopefully we're good.

    I'm going to memorize Pool School
    10,000 Gallon In-ground pool.

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    Mod Squad jblizzle's Avatar
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    Re: Trouble understanding FC test result

    Quote Originally Posted by aonis
    I'm going to memorize Pool School
    Well, that would make your the first
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    Re: Trouble understanding FC test result

    Quote Originally Posted by aonis
    Hi I just recently bought a Taylor k-2006 test kit.


    I do the 10ml setting
    I add 2 scoops of the R-0870 powder and swirl until it's bright pink.
    Just out of curiosity the taylor tf-100 only asks for 1 scoop of R-0870 powder. Are they different?
    1) The size of your pool in gallons 4440.
    2) The type filter you have is an Intex 2500 gph and it has a re-useable fabric filter
    3) If your pool is an AG (above ground)
    4) Intex 15 by 48 metal frame.
    5) If you know, tell us the size pump 2500gph and the size (flow rate) of your filter.
    Southeastern, Pennsylvania.

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    Re: Trouble understanding FC test result

    @raidencmc

    I've done the one scoop and the two scoop method and for some reason it didn't seem to make a big difference. Granted I don't really know what I'm talking about but I got the 2 scoop from a video I watched on youtube.
    10,000 Gallon In-ground pool.

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    Mod Squad Bama Rambler's Avatar
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    Re: Trouble understanding FC test result

    The instructions in the Taylor K-2006 says to use two level scoops and the instructions in the TF-100 says to use one heaping scoop. Both work because the amount of powder you use doesn't matter as long as there's enough to bind the chlorine.
    Dave J. TFP Moderator
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    Re: Trouble understanding FC test result

    Like Bama said as long as you have enough it does not matter to the test if you use some extra 870 powder, so depending on how you look at it Taylor may be a bit more cautious with their instructions (or maybe they think an instruction like a heaping spoon full is not professional looking), or they are just encouraging the uses to use more of their product so they could sell them a refill sooner.

    Ike
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    Re: Trouble understanding FC test result

    The CYA reagent certainly seems like they want you to run out quickly! 7ml every time you want to test. That seems ridiculous.
    10,000 Gallon In-ground pool.

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    Mod Squad jblizzle's Avatar
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    Re: Trouble understanding FC test result

    The K-2006 is very stingy with the CYA and the FAS-DPD regents ... that is why we generally recommend the TF-100 instead ... more bang for the $.
    Jason, TFP Moderator
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    Re: Trouble understanding FC test result

    You should only need to test CYA after an expected change in CYA. For example, after a stabilizer addition or after a partial drain and fill. Othewise CYA doesn't change fast enough to worry about.
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    Re: Trouble understanding FC test result

    I was surprised to realize how many people I talk to who don't know what CYA is. I test it 3 times unless we get a ton of rain.
    1) The size of your pool in gallons 4440.
    2) The type filter you have is an Intex 2500 gph and it has a re-useable fabric filter
    3) If your pool is an AG (above ground)
    4) Intex 15 by 48 metal frame.
    5) If you know, tell us the size pump 2500gph and the size (flow rate) of your filter.
    Southeastern, Pennsylvania.

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