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Thread: How long to complete a SLAM and OFCT

  1. Back To Top    #1

    Join Date
    Aug 2011
    Location
    Northern California
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    15

    How long to complete a SLAM and OFCT

    Hello,

    I am a 2nd year pool owner and have been reading the site for a year and just now realizing how much great info there is on here.

    Last year I spent the year bouncing up and down on my FC levels, so this year I learned about the SLAM and OFCT.

    So after having 3 dogs and 10 people in the pool on 4th of July I again started my chlorine/shock/test approach and as you can expect I did not have good results. So I learned more and now I am into my 3rd day of a SLAM and OFCT cycle. I just cannot get the FC to hold overnight. I am loosing about 5ppm so each day I check the pool several times and add liquid Chlorine to bring the level up to the right shock level (using the CYA Table) but it just keeps dropping.

    Sorry but I do not have all my numbers, but here is a good idea.

    Pool, 18,500 gals.
    2nd year Pebble tech finish
    in sun 50-60% of the day
    I usually use a solar cover but have had it off during the testing.

    CYA 30
    Trying to hold FC at 12ppm per cya chart

    I can get all the other numbers but when I had the pool store check them they were OK.

    We have had some small spots of algae that we could only see when swimming with gogles.

    I have been brushing the pool daily.

    Would just like to know how long the SLAM and OFCT should take? several days? a week? should I add more chlorine over the 12ppm mark?

    Also, my wife is wonder if our solar cover is part of the problem. There is what looks like some algae on the edges of the cover, will this keep contributing to the problem?

    Looking ahead to a much better summer,

    Mike
    Mike
    Northern Californio

    18,500 gallons
    Cartridge Filter
    Inground. Pebble Tech, Pentair Variable Speed Pump.

  2. Back To Top    #2
    Richard320's Avatar
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    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: How long to complete a SLAM and OFCT

    Three days is a little early to be expecting results. It didn't get messed up in three days, it will take more than that to clear it, too.

    I certainly hope you're doing your own FC testsing, and not letting "the pool store check them they were OK."

    Anything that might harbor algae - covers, toys, ladders, they all need to be exposed to the high FC levels during the slam process.
    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!

  3. Back To Top    #3
    Mod Squad Bama Rambler's Avatar
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    Jun 2009
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    SouthWest Alabama
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    Re: How long to complete a SLAM and OFCT

    Which test kit do you have?
    It's pretty hard to say how long it'll take. It's different for every situation.

    When running the OCLT, You are testing after dark and about an hour after the last chlorine addition & again before the sun rises aren't you?
    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

  4. Back To Top    #4
    Isaac-1's Avatar
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    May 2010
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    SW Louisiana
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    Re: How long to complete a SLAM and OFCT

    There is a lot of variation, but for most minor outbreaks like you describe around a week is fairly normal. A lot has to do with how consistent you are maintaining shock level, and doing your brushing. For some people, particularly those that don't stay on top of their FC levels and brushing it can take multiple weeks. The good thing is once cleared it should stay clear as long as you stay on top of keeping the water balanced through regular testing and correct dosing.

    Ike
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
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  5. Back To Top    #5

    Join Date
    Aug 2011
    Location
    Northern California
    Posts
    15

    Re: How long to complete a SLAM and OFCT

    Hello and thank you for the 2 quick replies.

    I do have one of the FAS test kits and I am using that for my FC.

    I will do a complete water check this evening and see if there are any other areas out of normal.

    Up to this point I think I have used 6 gls of chlorine (from Walmart) and a couple of bags of shock I had laying around.

    It sounds like I am moving in the right direction and I thank you for the comments. Now that I know a bit more of what to expect I will get another 4~6 gallons of chlorine and continue the testing.

    My pool does not get any sun until 10 AM or so, and then it is out of the sun around 6PM, so I have been doing the checking outside of those times.

    I am not in a rush, just would like to have the pool in good shape by this coming Monday.

    I will continue the SLAM and will update this post with all the other water tests tonight,

    Mike
    Mike
    Northern Californio

    18,500 gallons
    Cartridge Filter
    Inground. Pebble Tech, Pentair Variable Speed Pump.

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