Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 12 of 12

Thread: No FC - frustrated!

  1. Back To Top    #1

    No FC - frustrated!

    A little background first is in order... We have an inground 22,500gal w/SWG, sand filter and a vynil liner and are located outside Nashville, TN.
    Last year we converted to a SWG and had the best experiance ever!!! Highly recommended! Our costs were minimal and our testing barely wavered at all.
    However, this season is another story... we started out with good readings and proper levels all around until recently. Over the past few weeks we have had little to no free chlorine and a combined chlorine of 3 reducing to around 1 in the past week. We have tried shocking with a non chlorine shock at high doses to break the mythical barrier as well as a chlorine shock at high doses of over 10 lbs at a time. The water gets a bit of foam on the surface and you get the idea that something is happening but the next days testing always resulted in a very low FC reading. Just as a note we are treating for phosphates as we had a high reading early in the season but now it's just a maintainance dose. Then we tried cleaning the sand filter now twice, thinking that maybe the problem is in the sand... and last night went straight to 10 bottles of chlorine bleach at 6%. This resulted in alot of fine bubbles and we thought that maybe this was it, placed the robot cleaner in to not only move the water around, but continually brush the walls. A few hours later my wife tested out of curiosity and had a reading of 5 FC and 5 TC which would give us a CC of 0.
    This morning her readings were 0FC - 1TC ...
    What should we do next, replace the sand; more chlorine ... Help please!

  2. Back To Top    #2
    Mod Squad zea3's Avatar
    Join Date
    Jul 2009
    Location
    Houston, Texas
    Posts
    9,200

    Re: No FC - frustrated!

    More chlorine is the answer. If you could post a complete set of test results we can help narrow down exactly what is going on in your pool. Have you checked the cell in the SWG to see if it needs cleaning?
    TFP Moderator
    Helpful links: TF Test Kits,TFP Pool School, PoolMath
    Vogue 21' round AG, Pentair 1 hp 2 speed pump, 36 sq ft DE filter, Hayward S180T 150# sand filter, Houston, Texas
    Love TFP? Become a
    TFP Supporter!

  3. Back To Top    #3

    Re: No FC - frustrated!

    Yes, cleaned it twice and had it tested.
    Size-22500
    FC-0
    pH-7.3
    TA-100
    CYA-70
    Salt-3100
    Temp-82F
    SWG with a Vinyl liner

  4. Back To Top    #4
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,347

    Re: No FC - frustrated!

    How did you get those results?

    You need to shock the pool. What you're doing is throwing some stuff in there and hoping it works. Stop That!

    Read Pool School on how to shock your pool and follow that.
    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

  5. Back To Top    #5
    dmanb2b's Avatar
    Join Date
    Apr 2009
    Location
    NY
    Posts
    3,728

    Re: No FC - frustrated!

    As in Bama's sig...suggest you are done shocking when 1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    Shocking with CYA at 70, means raising your FC to 28ppm and holding at that level until the 3 criteria above are met
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

    Pool School, TFTestKits, Pool Calculator

  6. Back To Top    #6

    Re: No FC - frustrated!

    Test Kit ...
    we have been using shocks (chlorine and non-chlorine at shock levels) and have just recently tried plain chlorine bleach to see if that works.
    Given the prior results how many gallons of bleach should we shock with at 6% sodium hypochlorite to try and rectify the problem? The pool school suggests that I shock the pool to a level of 28 (given a CYA of 70) which is what we tried last evening, in fact I went 1.42 gal over the recommended dosage in frustration.
    Should we do the same dosage again?

  7. Back To Top    #7
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,347

    Re: No FC - frustrated!

    Which test kit?

    To go from 0 ppm FC to 28 ppm FC it will take 7 large (182oz) jugs. At that rate I'd start with about 20 large jugs. You should add and test every hour until you pass the OCLT with the swg off.
    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

  8. Back To Top    #8
    Butterfly's Avatar
    Join Date
    May 2007
    Location
    South Carolina
    Posts
    10,045

    Re: No FC - frustrated!

    You should CAREFULLY follow the directions in Pool School for How to Shock Your Pool:
    Here's a link: pool-school/shocking_your_pool

    Shocking your pool is a process and not a one-time event!
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  9. Back To Top    #9

    Re: No FC - frustrated!

    If I understand this correctly, I am to start with an initial dose to bring it to 28, then use the additional bottles to maintain every hour along with testing until I reach the desired numbers... Correct?

  10. Back To Top    #10
    Butterfly's Avatar
    Join Date
    May 2007
    Location
    South Carolina
    Posts
    10,045

    Re: No FC - frustrated!

    Quote Originally Posted by nomorepoolstore
    If I understand this correctly, I am to start with an initial dose to bring it to 28, then use the additional bottles to maintain every hour along with testing until I reach the desired numbers... Correct?
    Yes, initial dose to bring FC to shock level of 28.

    You can test as often as every hour and raise FC back up to the shock level of 28.

    Use the PoolCalculator.com to figure each dose.

    [EXAMPLE: Let's say you raise FC to shock level of 28. An hour later you test and FC is 20.
    You should add only enough bleach to raise FC from 20 to 28.

    Wait an hour and retest and adjust back up to shock level. [End: Example]

    Then, you maintain shocking until you meet the three criteria that show you are done.
    See red lines in my sig.
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  11. Back To Top    #11

    Re: No FC - frustrated!

    Success!!!
    Although we do not have a test kit that registers over 5PPM we went ahead and added an additional 11.36gal of 6% bleach. This morning we had a FC and TC of @ 5PPM which gave us a CC of 0PPM ... though a bit hesitant to celebrate we were happy to see improvement. Being a hot sunny day @ 92 we let it go and tested this afternoon with the following results.
    Thanks for your guidance!

    FC-5
    TC-5
    CC-0
    pH-7.2
    TA-110

    Now... on to the next question.
    We have been told in the past that when it comes to a SWG you only want to use the liquid form of CYA and not the granular. Is there any truth to the granular form being harmful to the salt cell?

  12. Back To Top    #12
    Butterfly's Avatar
    Join Date
    May 2007
    Location
    South Carolina
    Posts
    10,045

    Re: No FC - frustrated!

    Granular CYA is just fine for any type chlorine source

    I suggest you use the sock method to add the CYA.
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •