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Thread: Should I SLAM more?

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    Question Should I SLAM more?

    So, I have been battling High CYA since I moved in last year (end of June) and of course, I did not know that I had an issue until I joined TFP. I tried Bio-Active (http://http://www.troublefreepool.co...ing-bio-active), added two bags at different times, the first time, results are on that link above. The second time, it was basically worthless. I gave up, and started to do partial drains, for a couple of weekends, and finally, this past weekend I was able to lower my CYA to 50. All good, but then I started to get Algae, so as soon as I noticed, I started SLAM.

    Last night my pool passed OCLT with 0 loss (with pump on 24hrs), but today, the loss of chlorine during the day was very high, about 8ppm. Should I be worried that there's still something in the pool? Should I continue to SLAM? I never had CYA this low, this is my first pool, and it's very hot here in South Florida. So, I am not sure what my loss during the day should be, but I think 8ppm is too much, no?

    This is my test results since I first noticed the algae. I am using liquid chlorine 10% from Leslie's.

    Updated test results as of 7/26 (afternoon)

    2015-07-24_0824.jpg

    2015-07-26_1456.jpg

    Thanks!
    Last edited by alexvilper; 07-22-2015 at 07:44 AM. Reason: Updated test results
    30'x15' (3"-6")(15K+ Gallons); Hayward C1200 Star-Clear Plus 120-Square-Foot; Pentair SuperFlo - Two Speed - 1 HP - Barracuda G3

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    Divin Dave's Avatar
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    Re: Should I SLAM more?

    Hi Alex,
    8ppm does seem high. Its hot and sunny here in texas too, and I experience about 4 ppm loss in a day.

    How does your water look? Is it completely clear? It should be crystal clear.
    I certainly would do another OCLT.
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
    www.tftestkits.net Experience- it's what's learned just after you needed it most !!

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    Re: Should I SLAM more?

    Hi Divin, it's completely crystal clear. I will do another OCLT to make sure.
    30'x15' (3"-6")(15K+ Gallons); Hayward C1200 Star-Clear Plus 120-Square-Foot; Pentair SuperFlo - Two Speed - 1 HP - Barracuda G3

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    Re: Should I SLAM more?

    Well... Just tested again, and another 1.50 ppm is gone. FC is at 11ppm now. I guess I will raise it to shock level again, to be sure. Now, thinking about it, I haven't washed the filter since I started SLAM, could there be something stuck in it?
    30'x15' (3"-6")(15K+ Gallons); Hayward C1200 Star-Clear Plus 120-Square-Foot; Pentair SuperFlo - Two Speed - 1 HP - Barracuda G3

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    Mod Squad pooldv's Avatar
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    Re: Should I SLAM more?

    There shouldn't be algae growing in the filter, there is no sun and good water flow. Do you have a light, ladder, auto cleaner or anything else that algae could be hiding in?
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    Re: Should I SLAM more?

    I do have a light and a latter - my barracuda has been out of the pool since I began SLAMing. I just washed the filter, and turn the pump back on. I guess I should keep on it until the daily loss gets into a more realistic number?
    30'x15' (3"-6")(15K+ Gallons); Hayward C1200 Star-Clear Plus 120-Square-Foot; Pentair SuperFlo - Two Speed - 1 HP - Barracuda G3

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    Divin Dave's Avatar
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    Re: Should I SLAM more?

    check behind your light niche. Algae is famous for hiding in there.
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
    www.tftestkits.net Experience- it's what's learned just after you needed it most !!

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    Re: Should I SLAM more?

    I never took my light out. Tonight is too late for that. I raised the FC back to shock level. Tomorrow after work I will check the light. I assume, that I take the light out and scrub around the casing and inside the hole where it goes?

    Thanks!
    30'x15' (3"-6")(15K+ Gallons); Hayward C1200 Star-Clear Plus 120-Square-Foot; Pentair SuperFlo - Two Speed - 1 HP - Barracuda G3

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    Mod Squad pooldv's Avatar
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    Re: Should I SLAM more?

    Yes, one screw at the top and a tab at the bottom. Scrub the light capsule and all inside the niche. You can leave the light out on a towel on the deck for a day or two so water can flow in the niche and scrub it some more.
    TFP Moderator
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    Re: Should I SLAM more?

    It passed OCLT with 1ppm loss this morning (updated the image on the original post above). I think that's very tight, and CC is still at 0.5 - or at least it seems that way to me. Since chlorine is high, the test water kind of becomes yellowish/brownish instead of completely clear when I add enough reagent, I guess that's normal? But it makes it difficult for me to test CC at that point.

    I will work on the light this afternoon when I get back from work. Hopefully, it will be clean
    30'x15' (3"-6")(15K+ Gallons); Hayward C1200 Star-Clear Plus 120-Square-Foot; Pentair SuperFlo - Two Speed - 1 HP - Barracuda G3

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    Re: Should I SLAM more?

    It seems like it gets worse before It will get better. On the afternoon of the 23rd I removed light, and scrubbed inside the niche. Lots of dark gray smokey like stuff floated away. After that, the FC started to get eaten very aggressively, so I have been trying to maintain it above 20ppm. This morning I added enough chlorine to raise it to 30ppm. The weirdest thing is that the water is crystal clear, but I guess that's normal too. BTW, I have updated the image on the original post above, but I can't seem to find a way to change the size it gets displayed here. So, it's a little hard to read.
    30'x15' (3"-6")(15K+ Gallons); Hayward C1200 Star-Clear Plus 120-Square-Foot; Pentair SuperFlo - Two Speed - 1 HP - Barracuda G3

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    Mod Squad pooldv's Avatar
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    Re: Should I SLAM more?

    You are getting close. Cleaning out the light niche will probably get you there.
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    Re: Should I SLAM more?

    its always the light it seems. removing the light really should be in the SLAM directions, it seems no one can finish SLAM without removing it. I know I had to as well and it seems to always happen. same story usually...getting so close, water is crystal clear but FC still getting eaten up. we should tell people to remove the light at the beginning.
    Dan
    9,000 gallon in-ground Saltwater pool, plaster, cartridge filer, 1.0 hp pump, Hayward T-15 SWCG, TF-100
    Pool School - Chlorine / CYA Chart; Pool School - Test Kits Compared;

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    Re: Should I SLAM more?

    Thanks Dan. Another question: While SLAMing, do I attempt to lower PH again? I haven't tested it since I started, but I am sure it's around 7.8/7.9 now.
    30'x15' (3"-6")(15K+ Gallons); Hayward C1200 Star-Clear Plus 120-Square-Foot; Pentair SuperFlo - Two Speed - 1 HP - Barracuda G3

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    Mod Squad pooldv's Avatar
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    Re: Should I SLAM more?

    The PH test isn't valid when FC is above 10, need to wait until it is under 10 to retest.
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    Re: Should I SLAM more?

    Alex have you been brushing the pool every day? didn't see that in your story.
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
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    Re: Should I SLAM more?

    Shoot! I completely missed brushing it for the past 2/3 days. I brushed it the first couple of days, then completely forgot about it. I am usually eager to get testing and adding chlorine as soon as I get back from work, and then doing other house stuff, that brushing was completely neglected for the past couples of days. Just brushed it and I will make sure it gets brushed everyday until this is done. Thanks!
    30'x15' (3"-6")(15K+ Gallons); Hayward C1200 Star-Clear Plus 120-Square-Foot; Pentair SuperFlo - Two Speed - 1 HP - Barracuda G3

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    Re: Should I SLAM more?

    6 days into it, and no light at the end of the tunnel!

    Since 7/24 I started to keep FC at 30 to see if that helps, but so far, it seems that I am still losing around 1.5/2ppm chlorine per hour during the day. Pool is clean - the water is crystal clear. Filter is clean. Ladder and lights are clean (I left the light out all day yesterday). Skimmer is clean. Not sure what else to do, except to just keep dumping chlorine in it, and hope it will get stable.

    One thing I did do though. I opened my main drain, I thought maybe there could be algae in it? Not sure, but now it's 50% drain, 50% skimmer.
    30'x15' (3"-6")(15K+ Gallons); Hayward C1200 Star-Clear Plus 120-Square-Foot; Pentair SuperFlo - Two Speed - 1 HP - Barracuda G3

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    Re: Should I SLAM more?

    P
    Quote Originally Posted by alexvilper View Post
    6 days into it, and no light at the end of the tunnel!

    Since 7/24 I started to keep FC at 30 to see if that helps, but so far, it seems that I am still losing around 1.5/2ppm chlorine per hour during the day. Pool is clean - the water is crystal clear. Filter is clean. Ladder and lights are clean (I left the light out all day yesterday). Skimmer is clean. Not sure what else to do, except to just keep dumping chlorine in it, and hope it will get stable.

    One thing I did do though. I opened my main drain, I thought maybe there could be algae in it? Not sure, but now it's 50% drain, 50% skimmer.
    I just saw this thread, so I'm coming into it a little late.

    FC loss during the day really has no bearing on the SLAM. Remember, once you are above your minimum FC level chlorine loss is a percentage, not a fixed amount. So the higher you take the number, the higher your ppm FC loss will be. If you assume. 50% loss per hour on a sunny day with your 30FC you could lose 10-12 easily. Had you left it at 20 the loss might only be 6-8.

    If you have passed all three SLAM criteria (clear water, CC less than .5 and pass OCLT) then let the pool come down to normal levels. If you have a massive loss at normal levels then we may have a problem, but when the FC is highly elevated a higher loss is to expected during the day.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: Should I SLAM more?

    Oh! Thanks Tim. I will stop dumping chlorine and see how it goes. Thanks for jumping in, otherwise I would have continued this madness until there was no more chlorine at the store
    30'x15' (3"-6")(15K+ Gallons); Hayward C1200 Star-Clear Plus 120-Square-Foot; Pentair SuperFlo - Two Speed - 1 HP - Barracuda G3

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