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Thread: slam FC reading

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    blueyes39's Avatar
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    slam FC reading

    My first slam FC reading- 1.7
    I am not good at math lol. I think its 17?
    Darla Reed :-)

    25,000 gal, Nautalis NS60 D.E. filter, Plaster, IG, 30 plus yrs oval pool. Plaster resurfaced 10+ yrs ago.

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    Mr Bruce's Avatar
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    Re: slam FC reading

    How did you perform the FC test? Tell us each step.
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

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    Re: slam FC reading

    per the FAS/DPD drop test. I just started the slam this am, this was my first reading, I just need to know if its 17, I think it is lol. from 1.7 on the conversion.
    Last edited by blueyes39; 05-04-2016 at 10:05 AM. Reason: ypdate info
    Darla Reed :-)

    25,000 gal, Nautalis NS60 D.E. filter, Plaster, IG, 30 plus yrs oval pool. Plaster resurfaced 10+ yrs ago.

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    Re: slam FC reading

    Fill to 10 mL will pool water.
    Add heaping scoop of powder. Swirl. Pink indicates chlorine.
    Add one drop at a time until solution goes clear.
    Multiply # drops by .5

    Doing that there is no way you can get 1.7
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

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    Re: slam FC reading

    yep, did it twice. 34 drops before it turned clear.
    Darla Reed :-)

    25,000 gal, Nautalis NS60 D.E. filter, Plaster, IG, 30 plus yrs oval pool. Plaster resurfaced 10+ yrs ago.

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    Re: slam FC reading

    Great! What is your CYA level? Are you SLAMing?
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

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    Re: slam FC reading

    Lol, yes just started it at 830 am. this was my first FC reading after adding the required amount of chlorine, 1.7 was the first FC reading, its 17 correct? My CYA was 30 so my target FC is 12.
    Darla Reed :-)

    25,000 gal, Nautalis NS60 D.E. filter, Plaster, IG, 30 plus yrs oval pool. Plaster resurfaced 10+ yrs ago.

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    Re: slam FC reading

    34 * .5 = 17, so yes, 17 is your FC level. That's a little bit over the SLAM level of 12, as you obviously know, so your pool might be a little bit smaller than you think.
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

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    Re: slam FC reading

    Well it needed 333 oz and each bottle was 121, I guess poured lol. It full on sun here today, by tonight I will need to add more I am sure, lots of algae on the walls.
    Thanks for the quick reply!!!
    Darla Reed :-)

    25,000 gal, Nautalis NS60 D.E. filter, Plaster, IG, 30 plus yrs oval pool. Plaster resurfaced 10+ yrs ago.

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    Re: slam FC reading

    Yes Darla, you are on your way to better pool chemistry. We are certainly in for another beautiful day, so enjoy that poolside babysitting. Mr. Bruce got you up-to-speed on FC testing/readings, so now you just need to maintain that FC of 12. Review the SLAM page once a day to ensure you're not missing anything else vital to do each day. In time, you'll have this SLAM behind you. Have a great day.
    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
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
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    Re: slam FC reading

    How often are you testing? During the beginning of a SLaM, you need to test and redose as often as you can. It is recommended at least 4 times a day. More is better. I usually say test and redose every few hours. As the FC starts to hold then you can stretch it out between testing and redosing.
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

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    Re: slam FC reading

    Man, the algae is hard to get off the walls. I am using a wire pool bristle brush but its difficult to brush the sides down low since my pool is oval. I am using a plastic hand bristle brush for the spots on the top area I can reach, its working well!! Yes, I am testing every two hours and read the slam page 4 times already today lol. I want this stuff to go away! When I get to the end, how long should I backwash my pump? I have done it 6-8 times before and the nasty dirty stuff keeps coming out but I run out of water in the pool. Should I fill it and keep backwashing? I think I am going to take it apart to and hand clean the filters, that the only thing I haven't done in the past. Maybe that will do the trick.
    Darla Reed :-)

    25,000 gal, Nautalis NS60 D.E. filter, Plaster, IG, 30 plus yrs oval pool. Plaster resurfaced 10+ yrs ago.

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    Re: slam FC reading

    Ideally you should backwash until the water is clear, but if your water level gets low, you don't have a choice to stop if the only suction you have is from a skimmer. Those with a main drain will switch to the drain only. But even if you couldn't backwash 100% like you might want to, it helps and should make the filter pressure go down some. Backwashing is something you'll need to do the entire SLAM. Hopefully towards the end when the heavy stuff is gone it will slow down a bit for you. Be careful about taking apart DE filters if you've never done it before. Some might even recommend simply rinsing them in-place for right now, then at the end of the SLAM do a really good cleaning.
    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
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

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    Re: slam FC reading

    Third reading is at 12 now. Finally. Yes I know it's difficult to clean it but it has to be done. I may get my pool guy to do it lol. He fixes the equipment only for me. I will spray it down with a Clorox solution when he breaks it down. The discoloration on the bottom is now gone!!! I have been brushing it like crazy LOL. I'm soooo happy now. Back hurts but I'm happy.

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    Re: slam FC reading

    2nd and final day today! Pool looks great, all the algae is gone! I have a few questions for anyone who has an oval pool.

    1. Does anyone use the concave plastic bristle brushes and are they better than the straight metal bristle ones.
    2. any advice on cleaning the steps and corners around the steps. I have a hard time reaching the front parts of the steps, unless I get in the pool itself. During the cooler days I prefer not to lol.
    3. I have a plaster pool and when I brush it, a white cloud appears so I am unsure if this is normal? Its a lot to, I worry the plaster is breaking down?

    If I should ask this in another thread please tell me which one! Thank you all for your help and patience! Now, after I backwash later today, how long should I wait to do a full reading again? My target FC level is 2-7 and I am at 12 right now but I will need to add a lot of water to backwash, probably 2 inches worth. Any other info I need to know and do please tell me. Thanks again!!
    Darla Reed :-)

    25,000 gal, Nautalis NS60 D.E. filter, Plaster, IG, 30 plus yrs oval pool. Plaster resurfaced 10+ yrs ago.

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    Re: slam FC reading

    Good morning Darla. Let's make sure of a couple things okay:
    1 - Did you pass all 3 SLAM criteria (water clear; CC les that .5ppm; passed your OCLT test)?
    2 - If your CYA was 30 (because your SLAM FC was 12), then after the SLAM, your FC target zone will be 3-5; never below 2. But after the SLAM, after our temps increase closer to summer, you may need to increase yoru CYA more to protect the FC from the sun. When you do, always refer to the Chlorine/CYA Chart. I keep a printed copy in my test kit at all times.

    You might also want to verify CYA if you've done a lot of backwashing. It may have dropped a little. After the SLAM is complete, just go ahead and run a full set of test results to make sure they are all within the TFP recommended levels (link below). With those full tests, we can get an idea of your plaster. Hope that helps.
    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
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
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    Re: slam FC reading

    For the brushing... there are corner brushes that fit onto the pole that will get you into those tight corners around the steps:


    I like the Wall Whale. The fin provides the inwards force. All you have to do is pump it up and down on the walls.



    A lot of that white dust you see is just dust. It doesn't mean the plaster is disintegrating. Persistence should eventually get rid of it.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: slam FC reading

    Recommended Levels









    Vinyl with Bleach
    FC 3-7 (See chart)
    pH 7.5-7.8
    TA 50-90+
    CH 0-350 (Don't add)
    CYA 30-50
    with SWG
    FC 3-5 (See chart)
    pH 7.5-7.8
    TA 60-80
    CH 0-300 (Don't add)
    CYA 70-80
    Plaster with Bleach
    FC 3-7 (See chart)
    pH 7.5-7.8
    TA 70-90+
    CH 250-350
    CYA 30-50
    with SWG
    FC 3-5 (See chart)
    pH 7.6-7.8
    TA 60-80
    CH 350-450
    CYA 70-80
    Fiberglass with Bleach
    FC 3-7 (See chart)
    pH 7.5-7.8
    TA 70-90+
    CH 220-320
    CYA 30-50
    with SWG
    FC 3-5 (See chart)
    pH 7.5-7.8
    TA 60-80
    CH 220-320
    CYA 70-80



    This is the chart I looked at. There are 2 different ones but it does not matter really after reading all the info here, you need to adjust the FC level depending on Temp, swimming, debris, sun, etc. I will definitely keep it above 3 ppm so the algae does not come back. Most likely above 5 lol. I do not want to do that again. Very time consuming and back breaking LOL. I will post later tonight with the numbers. I hope the PH and CYA are in good ranges. I hope.

    - - - Updated - - -

    Oh thank goodness!! Thank you for the post!! Can I get those brushes online? Any recommended sites that one of yall use?
    Last edited by blueyes39; 05-06-2016 at 08:39 AM. Reason: update
    Darla Reed :-)

    25,000 gal, Nautalis NS60 D.E. filter, Plaster, IG, 30 plus yrs oval pool. Plaster resurfaced 10+ yrs ago.

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    Re: slam FC reading

    Yes to all 3 tests. I am good.
    Darla Reed :-)

    25,000 gal, Nautalis NS60 D.E. filter, Plaster, IG, 30 plus yrs oval pool. Plaster resurfaced 10+ yrs ago.

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    Re: slam FC reading

    Good job!

    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
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

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