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Thread: Free Chlorine Levels

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    Free Chlorine Levels

    Hi Folks,

    With my CYA at about 38-40. Using the Pool School Chart my target FC is 5. I had a couple of questions:
    1) Is it okay for me to use Pool Calculator and push the FC up to 6 and wait until it drops below 5 and repeat? Or can I let it go lower? Testing shows I have usually 0 - 0.02CC. I'm finding I need to add chlorine 1-2 times a day with this method, is that normal? I am using liquid Chlorine.
    2) For amount of Chlorine needed daily, I seem to be using about 750 - 900 mL / day, pool is ~15700gallons, would that be normal? This seems to be true on days the pool isn't even used. The pool does get a decent amount of sun during the day so I know some is lost there as well.

    None of this may be any issue, first year with the pool I didn't think I would need that much chlorine. I need to start stocking this stuff =)

    Thanks
    33' x 18' x 4' Oval Above Ground Pool (~15700 Gallon)
    Jacuzzi 15LRC-5-S1 1.5 HP Pump
    Sta-Rite T210WF Hi-Rate Sand Filter
    Hayward H400FDN Heater

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    Mod Squad tim5055's Avatar
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    Re: Free Chlorine Levels

    The idea of a target at 5 is so that it never goes below 3 for 40 CYA. So, target 5 so that it doesn't go below 3. The higher you push it the more you will loose every day because the "extra" isn't protected by the CYA

    Also, it appears you are using 25 mL sample for 0.2 ppm accuracy. You can go ahead and use 10 mL sample for 0.5 ppm accuracy. It will save you reagents and is close enough for us
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: Free Chlorine Levels

    Ah ok so going much higher than 5 isn't doing much. Good to know! Maybe that's why I'm using so much Chlorone

    I have a LaMotte ColorQ PRO 7 tester, it uses 5mL tubes I believe.


    33' x 18' x 4' Oval Above Ground Pool (~15700 Gallon)
    Jacuzzi 15LRC-5-S1 1.5 HP Pump
    Sta-Rite T210WF Hi-Rate Sand Filter
    Hayward H400FDN Heater

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    Whatrymes's Avatar
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    Re: Free Chlorine Levels

    I always begin with the range that is listed in "PoolMath" after all your numbers are input correctly. My pool is also at 40 ppm CYA so the CL range is listed as 3 - 7 ppm. Seven is more suggestive, I want to have enough chlorine in the pool to last till the next 24 hrs when I'll test and add again. The lower number, 3 ppm, is the critical number. I never want my water at 40 ppm CYA, to fall below 3 ppm of chlorine. I've found as I get to know how my pool reacts to sun, weather and bathing loads that I don't always need to achieve 7 ppm.
    15 X 30 X 3.6 Ester williams AGP
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    Texas Splash's Avatar
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    Re: Free Chlorine Levels

    Shani ... just FYI ... but since our pools are fairly close in size (capacity) .... when my pool is balanced throughout the season, I add (on average) about 1/2 gallon of bleach each day to the pool. That's about it unless I have a large amount of people in the pool or something very unusual happen that requires more. My pool is 100% exposed to the sun.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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    Mod Squad tim5055's Avatar
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    Re: Free Chlorine Levels

    Quote Originally Posted by Shani View Post
    I have a LaMotte ColorQ PRO 7 tester, it uses 5mL tubes I believe.
    Ah, that's another issue. The ColorQ has not had good results for folks around here.

    This thread is a few years old, but compares the ColorQ to our test kit of choice, the TF-100 ColorQ vs TF100

    We have already had a couple of people posting earlier this year that bought them and found they they were not reliable for consistent accurate numbers.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: Free Chlorine Levels

    Thanks Texas, makes me feel better!

    Tim, saw that article... Unfortunately I didn't join TFP until after I purchased the ColorQ. Looking into the TF-100. I would like to get it to even just compare results. My numbers have been pretty consistent with what chemicals I add via Pool Calculator but it would be interesting to compare the results.


    33' x 18' x 4' Oval Above Ground Pool (~15700 Gallon)
    Jacuzzi 15LRC-5-S1 1.5 HP Pump
    Sta-Rite T210WF Hi-Rate Sand Filter
    Hayward H400FDN Heater

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    Mod Squad tim5055's Avatar
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    Re: Free Chlorine Levels

    Quote Originally Posted by Shani View Post
    Thanks Texas, makes me feel better!

    Tim, saw that article... Unfortunately I didn't join TFP until after I purchased the ColorQ. Looking into the TF-100. I would like to get it to even just compare results. My numbers have been pretty consistent with what chemicals I add via Pool Calculator but it would be interesting to compare the results.


    Sent from my iPhone using Tapatalk
    I'd love to see a new comparison.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: Free Chlorine Levels

    Tried to order the TF-100 kit but the site doesn't seem to have a shipping option to Canada, I've emailed them to find out. May be out of luck.


    33' x 18' x 4' Oval Above Ground Pool (~15700 Gallon)
    Jacuzzi 15LRC-5-S1 1.5 HP Pump
    Sta-Rite T210WF Hi-Rate Sand Filter
    Hayward H400FDN Heater

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    Mod Squad tim5055's Avatar
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    Re: Free Chlorine Levels

    Quote Originally Posted by Shani View Post
    Tried to order the TF-100 kit but the site doesn't seem to have a shipping option to Canada, I've emailed them to find out. May be out of luck.
    They can't In Canada you have to buy the Taylor K-2006 as one company has an exclusive arrangement for the entire country from Taylor Chemicals. They are a bit pricey also.

    Got any friends south of the border?
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: Free Chlorine Levels

    Yeah, they legally cannot ship to Canada. There is a company in Canada that has exclusive rights (read: monopoly) to sell Taylor products in the country. So Dave cannot ship to Canada at all. You are unfortunately limited to the Color-Q or the Taylor k-2006. The k-2006 is a better choice, it is the same tests as the TF-100, just smaller amounts.
    JD - 28' Round Above Ground Pool, 17,000 Gallons. Dual speed Jacuzzi pump with cartridge filter. Dual speed 1 HP pump, Hayward S210T sand filter
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    Re: Free Chlorine Levels

    Thanks for the heads up! I'll look into the K-2006


    33' x 18' x 4' Oval Above Ground Pool (~15700 Gallon)
    Jacuzzi 15LRC-5-S1 1.5 HP Pump
    Sta-Rite T210WF Hi-Rate Sand Filter
    Hayward H400FDN Heater

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    Re: Free Chlorine Levels

    Ordered the Taylor K-2006. Once it arrives I'll post some results using it and the ColorQ.
    33' x 18' x 4' Oval Above Ground Pool (~15700 Gallon)
    Jacuzzi 15LRC-5-S1 1.5 HP Pump
    Sta-Rite T210WF Hi-Rate Sand Filter
    Hayward H400FDN Heater

  14. Back To Top    #14

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    Re: Free Chlorine Levels

    I seem to be having issues getting the FC level up, I'm trying to decide if the Liquid Chlorine I have is weaker than listed, I am using PoolMath wrong, or some other reason. I have used different bottles of liquid chlorine but they were all bought from the same place (Canadian Tire), only place I can buy them.

    For an example at 6:00pm today I did a test:

    FC: 3.65

    My CYA is ~40 (target FC of 5), I was having issues getting the FC up so I decided to put in a target of 6 in the PoolMath. It told me to add 1.5L of 10.3% liquid chlorine.

    Did another test at 7:30pm:

    FC: 4.51

    No one was using the pool during these times.

    Any thoughts?
    33' x 18' x 4' Oval Above Ground Pool (~15700 Gallon)
    Jacuzzi 15LRC-5-S1 1.5 HP Pump
    Sta-Rite T210WF Hi-Rate Sand Filter
    Hayward H400FDN Heater

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    Mod Squad pooldv's Avatar
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    Re: Free Chlorine Levels

    It sounds like you might have a low level algae bloom in your pool that is consuming chlorine. Try Performing the Overnight FC Loss Test (OCLT) to see if there is something organic in your pool consuming chlorine. Normal chlorine consumption should be 2-4 ppm per day.
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    Re: Free Chlorine Levels

    Hi pooldv, thanks for the reply. I did the OCLT and the loss was about 0.30. The % increase in FC I get seems very linear with what I add, feeling as if the liquid chlorine may be weak. Would that make sense with what is going on?


    33' x 18' x 4' Oval Above Ground Pool (~15700 Gallon)
    Jacuzzi 15LRC-5-S1 1.5 HP Pump
    Sta-Rite T210WF Hi-Rate Sand Filter
    Hayward H400FDN Heater

  17. Back To Top    #17

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    Re: Free Chlorine Levels

    For example in PoolMath if I put 3.5% as the % bleach instead of 10.3% chlorine as mentioned on the bottle. My number are pretty much right on for the amount I have put in and the FC level reached. Folks on TFP have also mentioned that the tester I have (ColorQ) from others feedback is not very reliable so I have a Taylor k-2006 ordered and on the way.

    I tried two FC tests tonight just from two diff samples of pool water taken at the same time. One FC reading was 4.95 the second was 5.20, that seems like pretty large difference to me.


    33' x 18' x 4' Oval Above Ground Pool (~15700 Gallon)
    Jacuzzi 15LRC-5-S1 1.5 HP Pump
    Sta-Rite T210WF Hi-Rate Sand Filter
    Hayward H400FDN Heater

  18. Back To Top    #18

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    Re: Free Chlorine Levels

    I did the OCLT test again lastnight. I lost 0.2 FC. I'm purchased some different bleach today. I'm going to try that out tonight and see if there is any difference.


    33' x 18' x 4' Oval Above Ground Pool (~15700 Gallon)
    Jacuzzi 15LRC-5-S1 1.5 HP Pump
    Sta-Rite T210WF Hi-Rate Sand Filter
    Hayward H400FDN Heater

  19. Back To Top    #19

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    Re: Free Chlorine Levels

    I know Lamotte gets a bad rap here, but other than some low readings on CH with the original reagents included with my kit (replaced for free by Lamotte with fresh reagents), I have had no issues with my ColorQ Pro. My readings line up perfectly with the pool store, so unless we're both consistently wrong, I don't think the kit is giving me bad readings. The pool store takes their time with the testing and they seem to strive for accuracy and provide a computer printout. My pool water is pristine.

    I'd be curious to see how your readings compare with the Taylor kit. Just make sure your Lamotte reagents, especially CH, are fresh and you keep everything clean and take your readings indoors.
    20x40 in-ground Bella Blue Pebble Fina pool w/diving board, 1 HP Hayward Superpump, Raypak RP2100 335k BTU NG mV heater, Pentair Quad DE 60 filter, Pentair 261173 multi-port valve, Stenner 45MPHP10 pump w/15 gal tank, Intermatic ET1125CR dual electronic timer, 1.5" lines, two skimmers w/socks, Poolskim, vacuum line, ColorQ Pro 7 kit, TF-100 kit, speedstir, 2 froglogs, Dolphin Discovery Robot. Wine is the answer, what was the question?

  20. Back To Top    #20

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    Re: Free Chlorine Levels

    Skimmerswimmer thanks for the info, the reagents I am using are the original ones that came with the unit.

    I used the different bleach today and the reading are much more accurate to what I expect using PoolMath.

    Unfortunately, I don't have a pool store where I live that I could use as another way of comparing.

    This may be a silly question but is there a "best" place to get the pool water from for testing? I usually just go to the end farthest from the return, I have an oval pool.
    33' x 18' x 4' Oval Above Ground Pool (~15700 Gallon)
    Jacuzzi 15LRC-5-S1 1.5 HP Pump
    Sta-Rite T210WF Hi-Rate Sand Filter
    Hayward H400FDN Heater

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