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Thread: SLAM-ing & Vacuuming help...

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    SLAM-ing & Vacuuming help...

    First want to say hello and thanks in advance for all of the help that this site provides. This is my first post and of course it is about Algae, as I'm sure most residential pool owners come here in search of help!

    So here's the back story on the fight with my pool this season.
    To start we had a KILLER winter, with record snow fall that brought the water level above my water-line tile, froze causing many of them to fall off. When I opened the pool, the water was extremely clear. I ordered the tile immediately but, it was a special order and took over a month to get. During this time, I had my first bloom, as I couldn't figure out a way to run the pool while still having the water level lowered (I figured this out). I shocked the pool as I would have shocked my previous non swg pool and the bloom went away(seemingly).
    Roughly 1 week later, my SWG Cell died. I replaced the cell within three days but, during that time, another bloom occurred, which I believe was largely due to the first bloom not being completely killed. This is when I SLAM'd for the first time and it worked well. However, one week after that, my Hayward Pump died. Of course it died on a Thursday and I didn't receive my replacement until Monday. The pool was still clear but, slightly cloudy. I shocked and hoped for the best.

    The pool cleared BUT, I seemingly had a ton of deal algae on the bottom of the deep end of the pool. This is where things get a bit tricky for me and I need some advice. When I vacuumed, my filter does well for about 10 minutes and then it just gets overloaded and dumps the dead algae back in the pool. Additionally, I can't see anything when this happens. Is this normal for a Cartridge Type filter? My previous pool had a Sand filter, so I am pretty unfamiliar with the tendencies of Cartridge type filters. Also, I realized that there's a good chance that some living algae was hiding among the dead algae and when vacuuming, it was spread throughout the pool when the filter became overloaded. Do I really have to clean this filter every ten minutes in order to vacuum this algae up?

    Moving on to my need to SLAM again, here are my numbers:
    Salt - 3200ppm
    FC - 3.5ppm
    PH - 7.4
    TA - 80
    CH - 250
    CYA - 30

    I know from Pool School that I need to get my CYA up immediately. Can someone recommend a good product to do so. I went to a local pool store and ended up being sold $400 worth of chemicals (some of which was stabilizer) and I simply cannot afford to spend $400 to bring my CYA level up.

    I used the Pool math to figure out that I need to add roughly 7 gallons of bleach to bring my FC level up to shock level and check every hour or so.
    If CYA dips during this time, am I adding stabilizer as well? Any other recommendations to help me through this process is GREATLY appreciated. We have been in our home less than a year and haven't been able to enjoy our pool once yet.

    Thanks again!
    40000Gal - Hayward 2 HP Super II - Hayward AquaRite w/ TurboCell AQR15 - Sta-Rite System 3 S8M150 - AquaCal HeatWave SuperQuiet SQ120R
    iAquaLink Wireless Controls w/ Jandy Valve Actuator & NeverLube Valves

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    Richard320's Avatar
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    Re: SLAM-ing & Vacuuming help...

    If you have algae and need to SLAM, don't raise the CYA yet. The SLAM is easier at 30 CYA than it is at 70.

    A swamp will load up any filter. I have no firsthand experience with cartridge filters, so someone else will have to comment on that.
    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-ing & Vacuuming help...

    Quote Originally Posted by Richard320 View Post
    If you have algae and need to SLAM, don't raise the CYA yet. The SLAM is easier at 30 CYA than it is at 70.

    A swamp will load up any filter. I have no firsthand experience with cartridge filters, so someone else will have to comment on that.
    I thought that I read with a SWG that I needed to bring my CYA up to between 70-80 in order to keep my FC at SHOCK level and not just lose what I am putting into the pool? Maybe I read it wrong?
    40000Gal - Hayward 2 HP Super II - Hayward AquaRite w/ TurboCell AQR15 - Sta-Rite System 3 S8M150 - AquaCal HeatWave SuperQuiet SQ120R
    iAquaLink Wireless Controls w/ Jandy Valve Actuator & NeverLube Valves

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    domct203's Avatar
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    Re: SLAM-ing & Vacuuming help...

    Quote Originally Posted by Nsm View Post
    I thought that I read with a SWG that I needed to bring my CYA up to between 70-80 in order to keep my FC at SHOCK level and not just lose what I am putting into the pool? Maybe I read it wrong?
    CYA at 60-70ppm for a SWG pool is to help maintain target levels of FC. You can SLAM at 60-70ppm CYA, but you will need to maintain FC at 24-28ppm versus the FC at 12ppm for a SLAM at 30ppm CYA.


    From the SLAM procedure:
    "SLAMing an outdoor pool is most effective when CYA is around 30 to 40. Below 30 you lose too much chlorine to sunlight. As CYA goes up, SLAMing requires more and more chlorine, which starts to get impractical around 80 or 90. With CYA above 90 we recommend replacing water to get CYA down before you start the SLAM process."

    Dom
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    Re: SLAM-ing & Vacuuming help...

    Quote Originally Posted by domct203 View Post
    CYA at 60-70ppm for a SWG pool is to help maintain target levels of FC. You can SLAM at 60-70ppm CYA, but you will need to maintain FC at 24-28ppm versus the FC at 12ppm for a SLAM at 30ppm CYA.


    From the SLAM procedure:
    "SLAMing an outdoor pool is most effective when CYA is around 30 to 40. Below 30 you lose too much chlorine to sunlight. As CYA goes up, SLAMing requires more and more chlorine, which starts to get impractical around 80 or 90. With CYA above 90 we recommend replacing water to get CYA down before you start the SLAM process."

    Dom
    Thanks Dom. I guess I was a bit confused based on the target CYA level for maintaining. I didn't see a target CYA level for a SWG for SLAM'ing and thought that if the maintenance CYA level for a non-swg pool was different than a SWG pool , then the SLAM'ing CYA level for a SWG pool would be different as well.

    Appreciate the help!
    40000Gal - Hayward 2 HP Super II - Hayward AquaRite w/ TurboCell AQR15 - Sta-Rite System 3 S8M150 - AquaCal HeatWave SuperQuiet SQ120R
    iAquaLink Wireless Controls w/ Jandy Valve Actuator & NeverLube Valves

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