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Thread: Backwashing every 4 days!!

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    Backwashing every 4 days!!

    Hi guys,

    I'm new to this forum and have never posted, so if I write something stupid, please forgive me.

    For the past couple of weeks, I've been having to backwash my D.E. filter every 4 or 5 days. So, I thought my filter needed a thorough cleaning. So on Thursday someone came out and took the filter apart and thoroughly cleaned it, and the pressure was great (18 p.s.i.). This morning (Monday) I wake up and check the pressure and it's already at 30.

    I haven't changed the type of D.E. powder I'm using, so I'm not sure what's going on.

    Thank you in advance for any help!!

    Laura

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    Butterfly's Avatar
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    Re: Backwashing every 4 days!!

    Welcome to the forum

    Well, it sounds like the filter is clearing stuff from the pool.

    Can you post a full set of water test results and tell us how you got them?
    We need:
    FC
    CC
    pH
    TA
    CYA
    CH

    How does your water look? A pic would be nice, too
    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. ~

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    Re: Backwashing every 4 days!!

    O.K. I'm at Lowe's picking up a new edger. I will post test results and a picture in about 1 hour.

    Thanks for the quick response.

    Laura

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    Re: Backwashing every 4 days!!

    OK - Here are my test results (17,000 gallon salt water pool). I did the test myself (TF-100 Test Kit), so if the readings are totally off the wall, I will drive to Leslie's and have them test our water.

    FC - 3 (too high?)
    CC - 10.5
    pH - 7.8
    TA - 110ppm
    CYA - 20ppm (we added 1 gallon of stabilizer from Leslie's, but I guess it wasn't enough?). I will go purchase more.
    CH - 380ppm

    [attachment=2:1igeshre]pool1.JPG[/attachment:1igeshre] [attachment=1:1igeshre]pool2.jpg[/attachment:1igeshre] [attachment=0:1igeshre]pool3.jpg[/attachment:1igeshre]

    Thanks again,

    Laura
    Attached Images Attached Images

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    Butterfly's Avatar
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    Re: Backwashing every 4 days!!

    Beautiful pool!

    First, I ask that you to retest the FC and CC to confirm.

    What was the CYA level before you added the gallon of CYA?

    Assuming the FC/CC test is correct, it looks like the CYA could have converted to ammonia.

    I suggest you do not add any more CYA until we confirm.
    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!

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    linen's Avatar
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    Re: Backwashing every 4 days!!

    Also, much lower priority then what Butterfly asked, but when you get a chance, could you put your pool and equipment info into your sig. I wanted to see what size DE filter you have in case it is undersized.
    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: Backwashing every 4 days!!

    This is a picture of my Chlorine test results:
    [attachment=0:3k8n1cxh]Chlorine.jpg[/attachment:3k8n1cxh]

    I got the following results:

    FC - 3
    CC - 10

    Before adding the stabilizer, the CYA was 0 according to Leslie's Water Analysis report. Here are the test results from their water analysis:

    FC - 1ppm
    TAC - 0ppm
    Calcium Hardness - 230
    CYA - 0 (Added 1 gallon of stabilizer) as instructed by Leslie's
    Total Alkalinity - 80
    pH - 7.4
    Phosphates - 1,000 (Added 2 capfuls of Phosfree + to skimmer) as instructed by Leslie's

    Is it possible for the reagents in my test kit to go bad? I looked for expiration dates, but couldn't find any.

    ====

    also the DE Filter is 48sqft
    Attached Images Attached Images

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    Re: Backwashing every 4 days!!

    Ignore phosphates, and don't buy anymore Phosfree!
    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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    harleysilo's Avatar
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    Re: Backwashing every 4 days!!

    I love picture posters, but awaiting confirmation of chlorine tests....
    18'x43' Sport Pool
    19,000 Gallons Vinyl Liner 3'-3.5'-4'
    SWCG and D.E. Filter
    Test Kits - Pool Calculator - Chlorine/CYA Chart - Pool School

    Secret Weapon for Pool Chemistry Testing

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    Re: Backwashing every 4 days!!

    You said you have a TF-100, can you please perform the FAS-DPD chlorine test? It apperas to me you are off the scale on the OTO test.
    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
    If TFP has helped you, please click to SUPPORT TFP!

  11. Back To Top    #11

    Re: Backwashing every 4 days!!

    TF-100 FAS-DPD chlorine test:

    Free Chlorine - 1
    Combined Chlorine - 10
    Total Chlorine - 11

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    harleysilo's Avatar
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    Re: Backwashing every 4 days!!

    Time to shock the pool!
    18'x43' Sport Pool
    19,000 Gallons Vinyl Liner 3'-3.5'-4'
    SWCG and D.E. Filter
    Test Kits - Pool Calculator - Chlorine/CYA Chart - Pool School

    Secret Weapon for Pool Chemistry Testing

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    Butterfly's Avatar
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    Re: Backwashing every 4 days!!

    It does appear that the CYA has been converted to ammonia and the cure is to shock the pool. I suggest you turn off the SWG and use bleach/liquid chlorine and shock until you meet the three criteria to be done shocking. See red lines in my sig.

    Follow the instructions for "How to shock your pool" in Pool School.
    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!

  14. Back To Top    #14
    linen's Avatar
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    Re: Backwashing every 4 days!!

    Quote Originally Posted by RisLC
    also the DE Filter is 48sqft
    Yours is the rare case of actually having the right sized filter for you pool
    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.

  15. Back To Top    #15

    Re: Backwashing every 4 days!!

    I am running to the store to pick up liquid bleach and will follow the instructions listed under "How to Shock Your Pool" in the Pool School.

    I want to thank you guys so much for all your help and advice. I'm going to have to start reading the posts and advice in this forum from now on, and stop getting advice from the staff at Leslie's Pool Supply. The staff is nice, but I'm not sure if they really know what they're talking about.

    Also, a question for RobbieH: Remember, I am a new pool owner, so don't laugh at my question. Why do I ignore phosphates?

  16. Back To Top    #16

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    Re: Backwashing every 4 days!!

    Since you need to shock the pool, do not add anymore CYA. This would boost the amount of chlorine needed for the shock. The shock is needed because there is something growing in the pool that is sucking up your chlorine. Yes, the free chlorine appears high on the OTO test, but you need to boost significantly. The Pool School and calculator should help you determine how much chlorine bleach is needed to shock your pool for a given level of CYA. pH also seems a little on the high side, but is not a huge concern. Once you have done the shock, you should get to a point where the CC level drops to less than 1. Under optimal conditions, it really should be zero. The reason why you are needing to backwash so frequently is that the stuff growing in your pool keeps clogging up your DE filter with their dead bodies!
    38K in ground pool with attached spa. Current equipment: Easytouch 8 (521150) with IC-60 SWCG with web control by Autelis, 1x Pentair IntelliFlo 011018 pump (for filter), 1x Pentair 2HP WhisperFlo pump (for waterfall), 2X Pentair IntelliBrite 5G 12V lights, Pentair MiniMax400 NG Heater, Pentair SMBW2060 DE filter. Zodiac Barracuda MX8 cleaner on dedicated cleaner line. Lighting/home automation controlled by Insteon/ISY-99i.

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    linen's Avatar
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    Re: Backwashing every 4 days!!

    Quote Originally Posted by RisLC
    Why do I ignore phosphates?
    In a properly chlorinated pool, phosphates can be high without problems. However, if you do use a phosphate remover you wallet will be lighter.
    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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