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Thread: Swimming and Slamming

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    Swimming and Slamming

    I just did my OFCLT and it looks like I need to slam. My water is crystal clear, but I noticed a couple of Algae spots and also that my FC numbers seemed to be a little lower than they should. At first I thought my CYA was off and I was losing the FC to sunlight. The CYA was off, so I corrected that, but still no real change in the FC. In any case here I am.

    My FC test last night was 5.5, and this morning it was 4. CC=0; Ph=7.5; and CYA=70.

    I have two questions, do I leave my SWG turned on while slamming, and can the kids swim during the slam (this likely won't be too much of a problem since we're due to get rain tonight through Monday)?
    26,700 Gal., 18x36 IG pool with Vinyl. 1HP Hayward Super Pump; Hayward DE3620 Filter; Hayward SAS; TFT-100 test kit; Dolphin Atlantis Cleaner.

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    Re: Swimming and Slamming

    It is much easier to control the SLAM (it really is a fairly precise process) with the SWG turned off.

    The official answer from TFP is that you can let the kids swim in anything UP TO SLAM value. You can sneak around that a bit by allowing them to jump in after the FC drops one point below SLAM.

    The COMMON SENSE answer is that it is a little easier to control the process if there is no swimming but nobody's arms and legs will fall off if you let them in.

    Other readers please keep in mind that the swimming advice is not generic. I based my suggestions on CLW42's particular numbers. You may get somewhat different advice from another TFPr because your numbers are different. Hope that makes sense.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: Swimming and Slamming

    Thanks Dave! I'll shut the SWG off. Since it's going to be lousy weather starting this afternoon, I'll make sure they have their fun this morning while I'm running to the store for some bleach.
    26,700 Gal., 18x36 IG pool with Vinyl. 1HP Hayward Super Pump; Hayward DE3620 Filter; Hayward SAS; TFT-100 test kit; Dolphin Atlantis Cleaner.

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    Re: Swimming and Slamming

    We have been in the same situation for a week or so. The heat and lots of swimming snuck up on us. FC dropped to 1.5 last Saturday and we had a dozen or so algae spots. Water crystal clear. CYA is 70, I jumped FC up to about 25 and brush 2-3 times per day and cleaned out the light niche. We have been swimming for hours pretty much everyday all week. Algae spots have been gone and not coming back since Monday. I'll do a full test today and swap the filters and probably call it done. My SWG is oversized enough that it can generate enough chlorine to keep it in the mid-20s which saves me hauling bleach, except the first day when I added 4 or 5 gallons to get it going.

    Gonna be another great swim weekend in Dallas! We haven't had enough this year, which is why we have to swim-n-slam! LOL
    TFP Moderator
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    Re: Swimming and Slamming

    Thanks Guys!

    But I do have a situation. I thought I had unplugged the SWG, and did not, so it was producing FC all day. I started my slam about three hours ago and just did my first test. My FC is now 41, which is WAY above the suggested 28. Obviously there's no swimming, but is there anything else I need or should do? I should have checked it again before starting the slam, but like I said, I thought the SWG was off so if anything I was expecting to be low, not high.
    26,700 Gal., 18x36 IG pool with Vinyl. 1HP Hayward Super Pump; Hayward DE3620 Filter; Hayward SAS; TFT-100 test kit; Dolphin Atlantis Cleaner.

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    Re: Swimming and Slamming

    You will be OK. That FC will come down on it's own rather quickly......continue the SLAM as if the pool was dosed correctly and simply replenish back up to 28 ppm when you drop below that.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Swimming and Slamming

    ^ ^ ^

    Thanks Dave. I was really nervous that it was bad news.
    26,700 Gal., 18x36 IG pool with Vinyl. 1HP Hayward Super Pump; Hayward DE3620 Filter; Hayward SAS; TFT-100 test kit; Dolphin Atlantis Cleaner.

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    Re: Swimming and Slamming

    WOW, that dropped fast. I was down to 29 this morning after a few good downpours which added about 2" of water. I'm sure that helped.

    Got another question: I'm pretty sure I see some algae in the light fixture. I didn't go in to check today, but I will tomorrow. If that's the case, will I be able to simply remove the two or three screws around the faceplate and get in there to clean it out? It's a Hayward LED light.


    Thanks again for all of the help! Maintaining 28 FCL now!
    26,700 Gal., 18x36 IG pool with Vinyl. 1HP Hayward Super Pump; Hayward DE3620 Filter; Hayward SAS; TFT-100 test kit; Dolphin Atlantis Cleaner.

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    Mod Squad JVTrain's Avatar
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    Re: Swimming and Slamming

    If it's a newer Hayward light. You'll need to remove one screw, then rotate counter-clockwise until you can pull it out. Looks to be about 1/8th turn or less.

    http://www.hayward-pool.com/pdf/manu...Operations.pdf
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

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    Re: Swimming and Slamming

    Yes, it's one of the newer ones. Thanks. So I don't have to drain or anything, just make sure the breaker is off and I can take it out and clean in there?
    26,700 Gal., 18x36 IG pool with Vinyl. 1HP Hayward Super Pump; Hayward DE3620 Filter; Hayward SAS; TFT-100 test kit; Dolphin Atlantis Cleaner.

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    Mod Squad JVTrain's Avatar
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    Re: Swimming and Slamming

    Yep. I would turn the breaker off for sure for safety. Not that I've ever taken mine out with just the light switch off... No need to drain at all. Hopefully it was installed properly and there is enough cable behind the light so that you can set it on the pool deck.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

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    Re: Swimming and Slamming

    Thanks, I'll give it a go.
    26,700 Gal., 18x36 IG pool with Vinyl. 1HP Hayward Super Pump; Hayward DE3620 Filter; Hayward SAS; TFT-100 test kit; Dolphin Atlantis Cleaner.

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