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Thread: Intex SWG not maintaining FC levels

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    Join Date
    Aug 2014
    Location
    Anderson, ca
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    28

    Intex SWG not maintaining FC levels

    So i get my pool dialed in and then my chlorine levels slowly drop to null. My SWG is not throwing any error codes, when on it is producing bubbles in the water so it is creating chlorine and i have it running 6 hrs a nite per the manual.
    My CYA are currently low but when last checked this was not the case.

    FC 0.5
    CC .05
    TC 1
    Ch 125
    Ph 8.2
    Ta 180
    CYA 40
    Salt 3000ppm

    I am going add, per the pool calc, 41 ox of bleach to get FC back up to 6.
    24 oz of Stabilizer
    8 lbs of salt to get back to 32ppm
    Ph and TA is currently high. Not sure how to lower them. Never had that problem before.

    The pool has been getting a lot of use and it has been HOT here, 110+. The chlorine might be just burning off faster than being created.
    5061 gal AG Intex 16 x 48 Ultra metal frame installed 8/10/14. 1500 gph Intex Cartridge Filter Pump with over side skimmer. Intex SWG 7k gal. TF-100 Kit

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    Texas Splash's Avatar
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    Jun 2014
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    South-Central Texas, Marion/San Antonio
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    Re: Intex SWG not maintaining FC levels

    You can lower TA and PH with muriatic acid (focus on PH more right now though). I suspect your SWG cannot keep-up with the FC demand based on that low CYA (lack of protection). Your FC was definitely low. Hopefully the water is clear. If not, you might need to do a SLAM. But if the water is good, then definitely raise that CYA and check it again in about one week once it has time to register.

    - - - Updated - - -

    After the adjustments, if you keep losing chlorine (FC), do an OLCT to ensure there are no organics in the water. Also, remember that by nature an SWG can increase PH simply by creating aeration (bubbles).
    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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    Piolin's Avatar
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    Sep 2010
    Location
    Miami, FL
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    Re: Intex SWG not maintaining FC levels

    Good post!!!
    8,400 gal Intex, 3K GPH pump, 16" sand filter, SWG CG-28669, TF100 test kit, speed stir, K-1766 Taylor salt test.

    The corner stone of TFP
    Pool School - Chlorine / CYA Chart

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    Join Date
    Aug 2014
    Location
    Anderson, ca
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    Re: Intex SWG not maintaining FC levels

    Water is perfectly clear. Will be adding muriatic, bleach and cya this evening. I have been trying to sneak up on my levels so i do not over shoot. But as soon as the levels were about right I would leave for a week and when i get home FC is 0 but the water is still clear. Nothing planned for a while so hopefully I will get it all set right and the SWG can work as it should.
    5061 gal AG Intex 16 x 48 Ultra metal frame installed 8/10/14. 1500 gph Intex Cartridge Filter Pump with over side skimmer. Intex SWG 7k gal. TF-100 Kit

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    jmcdtucson's Avatar
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    Jun 2014
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    Tucson, AZ
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    314

    Re: Intex SWG not maintaining FC levels

    Need to get the CYA up to about 75. It's a good idea not to over-shoot so sounds like a plan.
    It's possible the SWG is shot also. Hopefully not, but my intex one only lasted one year.
    Intex 12'x24'x52"
    8,403 gallons
    Intex SF60110 2450 GPH Sand Filter
    Intex CS8110 SWG
    Aquabot AJET121I Pool Rover S20-40

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    dakhath's Avatar
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    Jul 2015
    Location
    Central FL
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    35

    Re: Intex SWG not maintaining FC levels

    Are you sure that your CC is at 0.5 and not higher?
    It sounds like something is eating up your chlorine.
    I only say this because I also have a 16x48 inch pool and am running the Intex SWG as well.
    I was running the SWG at 5 hours per day but my FC levels were shooting up beyond a FC of 9 each day when tested in the mornings.
    I have since backed off to 4 hours per day and am holding at a nice steady 7 for FC.
    This is also with a CYA of 80, a CC of 0.0 and about 2-3 hours a day of kids playing in the pool at 84 degree water.
    I run the SWG between the hours of 4pm and 8pm each day to replenish what is lost to the day's usage and provide plenty of chlorine to eat any organics in the water overnight.

    Oops, reread Op's first post and misread CC levels as 0.5 not 0.05.
    Maybe the SWG is just working too hard and can't keep up.
    The difference between his 7,000 and my 15,000 gallon model SWG could be a factor.
    I don't have to run mine as long to achieve the same FC levels.
    Last edited by dakhath; 08-03-2015 at 04:43 PM. Reason: Misread OP's first post
    Coleman 5300 gal 16'x48" AGP
    Intex Krystal Clear 2800gph Sand Filter Pump 28647EG (56673EG)
    Intex Krystal Clear Saltwater System ECO 8110
    Taylor K-2006 & K-1766 test kits w/ Speedstir and Samplesizer

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