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Thread: SLAMing for 2 days now, pool has a FC habit

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    SLAMing for 2 days now, pool has a FC habit

    Preface this with an issue i had last week regarding test kit quality. replaced kit from tftestkits.com
    my pool since its opening this year has had a ferocious appetite for chlorine. 5-6 ppm a day. I know theres something in there but its crystal clear

    Since opening 2 weeks ago Ive added 9 gallons 8.25% clorox. almost every morning the FC is 0. pool clear the whole time.

    Saturday pool store test using tablets
    FC 3
    CYA 25
    ph 7.6
    TA 150
    CH 150

    Sunday using my refreshed tftestkit (clorox added since)

    FC2.5
    CYA 50
    pH 7.0
    TA 150
    CH 150

    I began SLAMing monday after work. based on the CYA/shock chart and my suspicion re: accurate CYA testing I selected CYA of 50 and went with a minimum shock of 21. Yes 1 ppm over the guide from chem geek.

    I used 5 gallons 8.25 % clorox according to poolmath and measured the FC at 9 pm monday night and it was 29.5 (have smaller pool than I thought?)

    Tues measured 7 am and down to FC 21. added 1 gal 8.25 went to work weather is cool and overcast 72 +/- degrees outside

    came home for lunch and tested FC at 24.5

    Added 1 gallon 8.25 at dinner and let it run til bed time. 10 pm FC 29.5

    This am (Wed) got up 6 am tested FC at 26.5

    So im still consuming a considerable amt of FC. Am i still on the right path? Ive battled this chlorine hungry pool for 2 years. Sick of it. Last summer I kept going cloudy > SHOCK > pass the OLCT > 3-4 days cloudy again.

    really ready to drain, new liner and hopefully itll go away.

    thanks tfp
    27' above ground
    voyager cartridge
    2.25 hp hayward pump 2 speed

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    Butterfly's Avatar
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    Re: SLAMing for 2 days now, pool has a FC habit

    So im still consuming a considerable amt of FC. Am i still on the right path? Ive battled this chlorine hungry pool for 2 years. Sick of it. Last summer I kept going cloudy > SHOCK > pass the OLCT > 3-4 days cloudy again.
    Yes, you are on the right path. Keep SLAMing until you meet/pass three criteria to determine SLAM is done. See red lines in my sig.

    In the past, it sounds like it might have been a maintenance issue. After the SLAM last summer, did you test and add recommended amount of chlorine each day?
    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: SLAMing for 2 days now, pool has a FC habit

    Hi Butteryfly, yes last summer I believe that i maintained well. RE the red lines in your sig, Im 2 for 3. After re-reading my post, my consumption went from 5 +/- mon>tues to 3 tue>wed so overnight consumption is going down. I tested CC monday but have not tues or this am. It was 0.0 Mon night so I doubt anything has combined but will test mid day. I found a youtube vid I think you may have posted on how to accurately test the CYA. Ive beeen doing it exactly as in the vid and I continue adding to the tube until absolutely no black dot is visible. i was worried i was being too subjective on the relative dissappearence of the black dot.
    27' above ground
    voyager cartridge
    2.25 hp hayward pump 2 speed

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    Butterfly's Avatar
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    Re: SLAMing for 2 days now, pool has a FC habit

    Have you checked behind lights & ladders & scrubbed every nook and cranny?

    After the SLAM is completed, we'll help you make sure the pool stays clean and sparkly. You need to figure out your pool's appetite for chlorine and make sure it has enough at all times. Easy Peasy.
    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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    Re: SLAMing for 2 days now, pool has a FC habit

    yes... well theres no lightts and the ladder is on the deck ive scrubbed as best i can while standing on the top ring. dont think getting in the pool at FC26 or so is a good idea. speaking of appetites, thats something that i guess would be hard to determine without considering usage, but what is a typical consumption per 1000 gallons a day before anyone uses the pool?
    27' above ground
    voyager cartridge
    2.25 hp hayward pump 2 speed

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    bridgman's Avatar
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    Re: SLAMing for 2 days now, pool has a FC habit

    Quote Originally Posted by justin_huffman View Post
    ...but what is a typical consumption per 1000 gallons a day before anyone uses the pool?
    The norm seems to be ~2ppm per day or a bit higher, so that would be ~3-4 oz of 8.25% bleach per 1000 gallons.
    Cedar hot tub, 680 US gallons - Snorkel wood-burning heater, canoe paddle, "offline" Intex 1000 GPH pump/filter with skimmer

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    Re: SLAMing for 2 days now, pool has a FC habit

    dont think getting in the pool at FC26 or so is a good idea.
    That's certainly your call but with CYA in your pool, you probably have less than 2 ppm actice FC. We suggest it is perfectly safe to swim in a pool up to Shock Value.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: SLAMing for 2 days now, pool has a FC habit

    Missed that post Dave, thank you.

    Update - I SLAMd all week, finally thrs into friday morning i passed the OLCT and at 6 am Friday morning i was at
    FC 20.5
    CYA 50
    TA 120
    pH 7.4

    This morning, i was shocked to take my readings and find 10 ppm loss in FC in 24 hours

    FC 10.5
    CYA 50
    TA 120
    pH 7.4

    the weather here yesterday was low 80s partly sunny and humid. Had a banger of rainstorm for about 20 minutes in the afternoon.

    I dont think this amount of FC loss can be attributed to sun burnoff. water is crystal clear. Im going to maintain a target FC of 7.5 based on my 50 CYA and the CYA chart. I came to that number with a minimum of 5.7 and 2.0 in reserve. we'll see how it holds up. thanks everyone.
    27' above ground
    voyager cartridge
    2.25 hp hayward pump 2 speed

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    Butterfly's Avatar
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    Re: SLAMing for 2 days now, pool has a FC habit

    Coming down from a slam, FC drops pretty fast. You lose a percentage, not a fixed amount. So you lose more PPM at higher FC.

    Sounds like you have a good plan

    Got a pic for us?
    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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    Re: SLAMing for 2 days now, pool has a FC habit

    thats good to hear butterfly thanks for your help I just finished a sub pad for my heat siphon, Ill snap a few of the surrounding area and tomorrow am when i pull the solar cover off ill get the clear water view thanks

    - - - Updated - - -

    still a little bit of construction mode, seems like its never done.
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    27' above ground
    voyager cartridge
    2.25 hp hayward pump 2 speed

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    Butterfly's Avatar
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    Re: SLAMing for 2 days now, pool has a FC habit

    Looks like a fun place!

    Nice tiki bar
    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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    Re: SLAMing for 2 days now, pool has a FC habit

    passed the OLCT every night since Friday until last night. Had 5.5fc and .5 CC at 7 pm and this am its down to .5 FC I cannot imagine what could be going on. The water is still quite clear. I can see debris starting to form on the bottom, grey in color. Could be dirt but I suspect some sort of algae. I dont understand how could pass the olct so many days in a row...
    27' above ground
    voyager cartridge
    2.25 hp hayward pump 2 speed

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    bridgman's Avatar
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    Re: SLAMing for 2 days now, pool has a FC habit

    It may mean you have algae in a place water doesn't get to overnight but does at other times. Maybe something in the pump/filter ?
    Cedar hot tub, 680 US gallons - Snorkel wood-burning heater, canoe paddle, "offline" Intex 1000 GPH pump/filter with skimmer

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    Re: SLAMing for 2 days now, pool has a FC habit

    maybe the pump. I didnt have anything in the pool, no steps or anything and the filter house is clean with a brand new filter.
    27' above ground
    voyager cartridge
    2.25 hp hayward pump 2 speed

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    Casey's Avatar
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    Re: SLAMing for 2 days now, pool has a FC habit

    Quote Originally Posted by justin_huffman View Post
    thats good to hear butterfly thanks for your help I just finished a sub pad for my heat siphon, Ill snap a few of the surrounding area and tomorrow am when i pull the solar cover off ill get the clear water view thanks

    - - - Updated - - -

    still a little bit of construction mode, seems like its never done.
    You have a very nice set up there!
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

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    Butterfly's Avatar
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    Re: SLAMing for 2 days now, pool has a FC habit

    Quote Originally Posted by justin_huffman View Post
    passed the OLCT every night since Friday until last night. Had 5.5fc and .5 CC at 7 pm and this am its down to .5 FC I cannot imagine what could be going on. The water is still quite clear. I can see debris starting to form on the bottom, grey in color. Could be dirt but I suspect some sort of algae. I dont understand how could pass the olct so many days in a row...
    Did you perhaps put the cover back on the pool?.....maybe with some algae on it?
    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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    Re: SLAMing for 2 days now, pool has a FC habit

    butterfly - I used a solar cover 2 days during the SLAM. took it off friday morning.
    @Casey thanks We love it, so much so the camper and the boat are STILL in storage for 2014. I doubt the boat will come out as "pool Sundays" are so relaxing and entertaining I feel guilty Monday morning lol.

    because my FC bottomed out doesnt exactly mean i need to start the SLAM again does it? Im going to just keep the FC at 7.5 and hope for the best.
    27' above ground
    voyager cartridge
    2.25 hp hayward pump 2 speed

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