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Thread: First SLAM - questions

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    First SLAM - questions

    hi all

    wasn't around to check my pool the last few days, and it developed some visible green algae

    the water has been and was clear before i started the SLAM, and no other issues

    using a clear choice labs test kit

    pre-SLAM:

    FC maintained around 6-7
    CC always < 0.5
    CYA 70
    pH 7.6

    SWG run ~ 6 hours a day @ 60% usually keeps FC stable

    so i dropped pH down to 7.2
    FC was 6, so added 4800mls of 12.5% chlorine to raise FC by 22 (25K litre pool)
    and brushed the spots i could see had growth (brushed from outside the pool)

    was running the SWG @ 100% (produces 170g chlorine/6 hours) testing of FC in the first 24 hours has seen FC level increase up to 32 without any addition of chlorine???

    about 30 hours into the SLAM and a bit of brushing with a steel brush, FC never dipped below 30, the water was the clearest i've ever seen it

    but i had suspicions there was still growth (it's a pebblecrete pool, so 1) it's hard to see what's algae and what's pebble from the surface; and 2) the algae loves to get in between the pebbles), so i jumped in the pool with my snorkel on, and sure enough there were still patches of green

    so i got out the steel brush and brushed as much of the algae by hand as i could handle (it was cold, and i didn't want to be in the pool with FC @ 30+ for long)

    would 32 hours @ shock level be long enough to start killing the algae? there were definitely some green patches when i looked close up

    i tested CYA twice to make sure, as i thought it may be higher than i thought, but tested both times @ 70

    seems weird that there was quite a bit of algae when i hopped in and took a closer look, but i haven't had to add more FC since the original lot, just had the SWG running @ 100% and FC level has been steady/increasing (started @ 28, 30, 31, 32, 31)

    going through a butt load of the chlorine test chemicals, even using a 5ml sample and counting each drop as 1ppm FC

    should i add more FC?

    or should i just keep the SWG @ 100% and the pump running for another couple of days?

    i would have thought that level of chlorine (despite the CYA level) would smash up the algae, but it seems to settle nicely between the pebbles
    25,000L / IG / Pebble / Zodiac C170 SWG / Waterco CC75 Cartridge Filter / Hurlcon CX 240 Pump
    G'day from Sydney, Australia

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    Re: First SLAM - questions

    Remember a SLAM with visible algae can take at least several days -firstly to get on top of it and then completely kill it off. Algae also loves nooks and crannies. Sounds like you've got a pretty good handle on the process and it was a good idea to get in the pool and brush it by hand to make sure you're getting it. Despite all that- if you still have visible algae it doesn't matter what is happening with your FC, you need to continue the process. Also if your running the SWG 100% then it will be adding FC.

    Don't worry about the high FC level - it is safe to swim in up to the SLAM level for your CYA. And if you were having problems seeing it, I'd get in each day just to check and brush any suspicious areas.

    I'd also turn off the SWG- mainly to save it but just using liquid chlorine to SLAM gives you an idea of how much FC you are losing. If your confident on your CYA reading stay the course and brush regularly, you should notice a reduction in the visible algae over time.
    11 000 gallons, IG, Fibreglass, Monarch Sand Filter, Davey Typhoon C100M 1HP pump, Davey Chloromatic Mc16CTO ESR SWG, Davey Pool Wall Climba Robot, Daisy Solar Cover,
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    Mod Squad kimkats's Avatar
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    Re: First SLAM - questions

    algae forms a "cover" that protects it from it's killer-chlorine! My guess is you just happened to miss brushing the areas you saw the green in.

    I would keep up the SLAM and brushing for a little while longer to make sure you get it all.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: First SLAM - questions

    Quote Originally Posted by Jezza View Post
    Remember a SLAM with visible algae can take at least several days -firstly to get on top of it and then completely kill it off. Algae also loves nooks and crannies. Sounds like you've got a pretty good handle on the process and it was a good idea to get in the pool and brush it by hand to make sure you're getting it. Despite all that- if you still have visible algae it doesn't matter what is happening with your FC, you need to continue the process. Also if your running the SWG 100% then it will be adding FC.

    Don't worry about the high FC level - it is safe to swim in up to the SLAM level for your CYA. And if you were having problems seeing it, I'd get in each day just to check and brush any suspicious areas.

    I'd also turn off the SWG- mainly to save it but just using liquid chlorine to SLAM gives you an idea of how much FC you are losing. If your confident on your CYA reading stay the course and brush regularly, you should notice a reduction in the visible algae over time.
    my problem is, i'm back at work now, and won't get home till around 18:00 when it will probably be too cold/dark to get in the pool and brush

    so i've left the SWG on 100% to keep the FC up during the day and will test again tonight

    FC was 32 this morning
    25,000L / IG / Pebble / Zodiac C170 SWG / Waterco CC75 Cartridge Filter / Hurlcon CX 240 Pump
    G'day from Sydney, Australia

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    Re: First SLAM - questions

    No worries- just brush the pool as best you can from the outside and maintain the SLAM chlorine level.
    11 000 gallons, IG, Fibreglass, Monarch Sand Filter, Davey Typhoon C100M 1HP pump, Davey Chloromatic Mc16CTO ESR SWG, Davey Pool Wall Climba Robot, Daisy Solar Cover,
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    Re: First SLAM - questions

    FC was 36 when i got home from work

    was a bit cold to get in the pool, so brushed as best i could from where i could remember the spots were

    dropped SWG to 80%

    will try and come home from work early tomorrow, to give it a brush from inside the pool, then will do an OCLT

    the water is the clearest i've ever seen it at the moment!

    hopefully algae is dead by tomorrow
    25,000L / IG / Pebble / Zodiac C170 SWG / Waterco CC75 Cartridge Filter / Hurlcon CX 240 Pump
    G'day from Sydney, Australia

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    Re: First SLAM - questions

    Hey Stooge
    Next time you brush, i would brush the whole pool. Sometimes you cant see the algae on the sides in its early stages
    When I did my last slam I also wiped the skimmer and jets with a cloth, just in case, cos I couldnt see anything on them. But I ended up with a slightly green tinted cloth after I finished...
    6000 gal, AG vinyl, Intex ultra frame 16ft, 1200 Gallon Sand Filter, DIY Solar, Clear Choice Labs Testing Kit

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    Mod Squad kimkats's Avatar
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    Re: First SLAM - questions

    I have a toothbrush for my pool It is great to get around the skimmer and return.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: First SLAM - questions

    Quote Originally Posted by Caco View Post
    Hey Stooge
    Next time you brush, i would brush the whole pool. Sometimes you cant see the algae on the sides in its early stages
    When I did my last slam I also wiped the skimmer and jets with a cloth, just in case, cos I couldnt see anything on them. But I ended up with a slightly green tinted cloth after I finished...
    i brushed the whole pool on the weekend

    will hopefully have time to brush all over again tonight

    hoping everything is dead by now, this will be Day 4 of FC > 28
    25,000L / IG / Pebble / Zodiac C170 SWG / Waterco CC75 Cartridge Filter / Hurlcon CX 240 Pump
    G'day from Sydney, Australia

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    Re: First SLAM - questions

    It amazing how clear a TFP pool is.

    If you run the OCLT tonight don't forget to switch the SWG off.
    11 000 gallons, IG, Fibreglass, Monarch Sand Filter, Davey Typhoon C100M 1HP pump, Davey Chloromatic Mc16CTO ESR SWG, Davey Pool Wall Climba Robot, Daisy Solar Cover,
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    Re: First SLAM - questions

    is running the pump/filter with SWG off recommended during OCLT, or switch everything off?
    25,000L / IG / Pebble / Zodiac C170 SWG / Waterco CC75 Cartridge Filter / Hurlcon CX 240 Pump
    G'day from Sydney, Australia

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    Re: First SLAM - questions

    You've got it, run the pump with the SWG off. If it is adding FC you can't tell how much you are (or aren't) losing.
    32K gallon Plaster - CircuPool SJ-55 SWG - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL/K-1766
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    Re: First SLAM - questions

    got in the pool and pressure washed all the algae i could see

    there were still some very minor green patches

    for the most part, was pretty algae free

    FC sitting at 37, will drop SWG right down

    pretty sure i'd pass an OCLT at this point, but will keep the SLAM going another day

    much longer process than i'd thought!
    25,000L / IG / Pebble / Zodiac C170 SWG / Waterco CC75 Cartridge Filter / Hurlcon CX 240 Pump
    G'day from Sydney, Australia

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    Re: First SLAM - questions

    Yep good plan if you can still see algae you unfortunately need to keep going. How are your reagents going- you don't want to have come this far to run out.
    11 000 gallons, IG, Fibreglass, Monarch Sand Filter, Davey Typhoon C100M 1HP pump, Davey Chloromatic Mc16CTO ESR SWG, Davey Pool Wall Climba Robot, Daisy Solar Cover,
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    Re: First SLAM - questions

    Just to make the point very clear. If you see any algae anywhere in or on your pool; you aren't done yet. If you were to stop now, the chances are very good that you would just need to start all over again.
    Bob - INTEX 12x24 owner (not setup yet), 'New to me' Kreepy Krauly Sand Shark, Test kit: TF-100 w/Speed Stir

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    Re: First SLAM - questions

    turned SWG off, FC had drifted down to 27

    i thought i may as well keep things going, but probly won't be home tomorrow to test etc.

    so added another 1L of chlorine to raise FC by 5, just in case i can't make it home tomorrow night

    will maybe have to wait till Saturday (2 days away) do do an OCLT, but pretty confident everything will be dead by then
    25,000L / IG / Pebble / Zodiac C170 SWG / Waterco CC75 Cartridge Filter / Hurlcon CX 240 Pump
    G'day from Sydney, Australia

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    Re: First SLAM - questions

    Well done in keeping it up. Have you looked to see if there is any more algae. Also wondering if you can do a quick test and redose before heading off tomorrow?
    11 000 gallons, IG, Fibreglass, Monarch Sand Filter, Davey Typhoon C100M 1HP pump, Davey Chloromatic Mc16CTO ESR SWG, Davey Pool Wall Climba Robot, Daisy Solar Cover,
    K-2006

  18. Back To Top    #18

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    Re: First SLAM - questions

    Quote Originally Posted by Jezza View Post
    Well done in keeping it up. Have you looked to see if there is any more algae. Also wondering if you can do a quick test and redose before heading off tomorrow?
    haven't been in the pool yet, we've had torrential rain in Sydney the past couple of days

    had to pump put some water last night, otherwise pool was going to overflow

    FC was 27 this morning, but i would've lost some CYA in the pumping out of water, will need to test that when the sun comes out

    going to be cold and rainy all weekend, so may as well keep FC @ shock today, then OCLT tonight and then let FC drift from tomorrow (Sunday)
    25,000L / IG / Pebble / Zodiac C170 SWG / Waterco CC75 Cartridge Filter / Hurlcon CX 240 Pump
    G'day from Sydney, Australia

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    Re: First SLAM - questions

    The cold weather should help you out for sure. It'll be interesting to see how your OCLT goes tonight.

    (We on the other side are expecting 36 degrees over the weekend.)
    11 000 gallons, IG, Fibreglass, Monarch Sand Filter, Davey Typhoon C100M 1HP pump, Davey Chloromatic Mc16CTO ESR SWG, Davey Pool Wall Climba Robot, Daisy Solar Cover,
    K-2006

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    Re: First SLAM - questions

    forgot to update

    passed OCLT on Sat night, FC drop of ~ 1 (29 -> 28), CC of 0, water clear as

    so now going to let FC drift down, but will re-check CYA when it's sunny again (given i pumped out a bunch of water when it was storming last week)

    cheers all
    25,000L / IG / Pebble / Zodiac C170 SWG / Waterco CC75 Cartridge Filter / Hurlcon CX 240 Pump
    G'day from Sydney, Australia

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