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Thread: Another Algae Thread

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    Another Algae Thread

    Is it "normal" to take 7 days to get chloring usage down and CC below .5? I have been at shock level (25-40 fc) for 168 hours now and just tested CC and it's back up to 5. I just took out the lights (spa and pool) about 52 hours ago (since it was so cold and I hesitated on getting in the pool). I did take the lid off of the auto-fill and there was some slight brown looking dust so I treated it with bleach several times over the last couple days. The water has been crystal clear the entire time so i'm confused.

    FC has been above 20 for the entire time
    CC fluxuates from 2.5-5
    PH started at 7.2
    TA 70
    CH 290
    CYA 55
    OCLT 2

    I never saw any algae on the walls but did see some brown dirt looking stuff inside thhe light niche. I have had a brown dust on the bottom and tanning ledge when brushing, which attributed to construction across the street but maybe it was the start of mustard algae? The only reason I realized I had any problem was that i could not get my FC up to where I targeted. I chorinate with a Stenner pump and 8.25% bleach from Kroger. I have been combining the stenner pump and manual bleach dosing while doing this SLAM.

    So is 7 days, even coming from a clear pool, a normal length for a SLAM?

    Thanks,

    Mike

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    Re: Another Algae Thread

    In general sounds like you know what you're doing. I think 7 days is the longer end of normal.

    Have you done an OCLT?

    What test kit are you using?

    can you add pool info to you signature?
    20' X 40' IG vinyl lined; 31,300 gallons; built ~30years ago
    Hayward 1HP Single Speed Pump w/Sand Filter
    Taylor K-2006,Rola-chem sodium hypo feeder/ 15 gallon tank
    Fill from soft/neutral well water, low flowrate well pump

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    Re: Another Algae Thread

    Added Signature...I think.

    - - - Updated - - -

    2nd try
    Completed October 31,2017
    16,125 gallon,IG, Stone Scapes Tahoe Blue Pebble/7' Rolled Bond Beam Spa/45' weeping wall/tanning ledge/Jandy 2hp VS EPump/Jandy 2hp VS EPump feature pump
    1HP Booster/Polaris 280 Black Max/CL460 Filter/JXI 400,000 gas heater/2-Deck Jets/Auto Fill/Stenner 85MHP5 and 15 gallon Stenner tank

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    Re: Another Algae Thread

    Using Taylor K-2006 test kit. OCLT the last 2 nights was right at 2.
    Completed October 31,2017
    16,125 gallon,IG, Stone Scapes Tahoe Blue Pebble/7' Rolled Bond Beam Spa/45' weeping wall/tanning ledge/Jandy 2hp VS EPump/Jandy 2hp VS EPump feature pump
    1HP Booster/Polaris 280 Black Max/CL460 Filter/JXI 400,000 gas heater/2-Deck Jets/Auto Fill/Stenner 85MHP5 and 15 gallon Stenner tank

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    Oly's Avatar
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    Re: Another Algae Thread

    2ppm FC overnight is a concern. Does your spa water mix with your pool? Any other places for algae to hide in your pool water? I have heard stories of folks having algae in their auto fill pipes, can you cap the pipes temporarily and see if it lowers your FC usage.
    27,000 gallons of central CA well water housed in a fiberglass coated concrete/plaster pool, dug into the most productive top soil on earth and surrounded by an urban forest.
    Cleaned with a Pentair 48 sq ft DE filter and Pentair Rebel suction side pool cleaner with large inline leaf canister. 250 gal Hot Springs Solana RX stand alone spa. Taylor K-2006. My first thread... New Old House, New Old Pool....

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    Mod Squad Texas Splash's Avatar
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    Re: Another Algae Thread

    Hi Mike! Well, 7 days is getting to the point where you should be really fine-tuning a minor loss if any by now. So this is where we step back and review some basics since many times we get so caught-up with the SLAM ourselves we miss something right in our face. So here are some thoughts I'd pass along for you to consider:
    - If you have no doubt about your CYA test, then I'd round-up 55 to 60. That would make sure FC SLAM level 24. But definitely make sure that CYA good.
    - CC can fluctuate, and that's okay. While everyone thinks zero is required, as long as it doesn't exceed .5 we still consider that about the same - very little present.
    - Your water is clear, so now it's a matter of that OCLT. The OCLT can be tricky for the following reasons:
    -- CYA/FC balance requires adjusting or one of them were off
    -- Still some algae undiscovered in the pool or equipment
    -- Testing error (either at the start or end of OCLT)
    -- Poor water circulation before either stage of the OCLT (should not apply since a SLAM requires the pump on 24/7)
    -- Grabbing water samples from different parts of the pool

    Your pool is fairly new, but something must be consuming chlorine you can't see if all the testing is good. I'd look under your skimmer lids, anything else that may still be in the pool, and especially that waterfall. Waterfalls, ledges, spillways, etc tend to leave pockets for stagnant water to collect and grow algae. I'm guessing your filter pressure isn't rising too fast, but if you haven't checked it lately, perhaps open it up for a good cleaning as well. I realize some of the things I noted you may have done, but wanted to point them out just in case. Hang in there and let us know if you crack the code on that pool of yours.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

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    Re: Another Algae Thread

    I have been pouring about a cup of bleach in thhe auto fill several times a day to kiil anything in thhe pipes. I may try to cap it off to rule out another potential source.
    Completed October 31,2017
    16,125 gallon,IG, Stone Scapes Tahoe Blue Pebble/7' Rolled Bond Beam Spa/45' weeping wall/tanning ledge/Jandy 2hp VS EPump/Jandy 2hp VS EPump feature pump
    1HP Booster/Polaris 280 Black Max/CL460 Filter/JXI 400,000 gas heater/2-Deck Jets/Auto Fill/Stenner 85MHP5 and 15 gallon Stenner tank

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    Re: Another Algae Thread

    Texas Splash, Thanks for all the great suggestions! The Pool Calculator says CF 18 for a CYA of 60 (or am I missing something?) but actually I ran up in the high 30's for the first several days and only let it drift down to 22-24 the last couple days. I will look closer at the weir doors shortly. I always get the water sample from the same spot to hopefully eliminate variances in samples. I believe I have been testing correctly and verified my #'s by taking a sample to the pool store a couple months ago. I did clean the filter cartridges 3 weeks ago and my pressures looks no different than when I first cleaned them. I think I am going to keep the weeping wall running 24/7 as well now just in case there is something in there growing.
    Oly, The mention of capping my auto-fill got me thinking. It's tied into my sprinkler system so over Winter the water may sit in the pipes a long time. Another possible source I suppose.
    Completed October 31,2017
    16,125 gallon,IG, Stone Scapes Tahoe Blue Pebble/7' Rolled Bond Beam Spa/45' weeping wall/tanning ledge/Jandy 2hp VS EPump/Jandy 2hp VS EPump feature pump
    1HP Booster/Polaris 280 Black Max/CL460 Filter/JXI 400,000 gas heater/2-Deck Jets/Auto Fill/Stenner 85MHP5 and 15 gallon Stenner tank

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    Mod Squad Texas Splash's Avatar
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    Re: Another Algae Thread

    Another possible source I suppose.
    Absolutely! To give you an idea how much impact algae can have, some people have been known to leave pool toys in the water during a SLAM, only to find out the toys were filled with algae. It's a sneaky bugger.

    As for the CYA-FC relationship, not sure about that CF 18 you were referring to, but if you're sure your CYA is at 60, then always refer to the Chlorine/CYA Chart to compare (link below in my sig). You'll see the CYA of 60 = a Shock of "24", and it sounds as though you've been in that area to begin with. It's good to be accurate though since too much bleach becomes a waste to the sun, so we don't want you to waste $$ either. Good luck this evening on your investigative work around the pool. If your weather is anything like ours in S.A., it's been beautiful, so enjoy it while you can.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

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    Re: Another Algae Thread

    OCLT was 1 last night CC still 2.5 but at least there's progress. Hopefully something I did in the last couple days may be working.
    Completed October 31,2017
    16,125 gallon,IG, Stone Scapes Tahoe Blue Pebble/7' Rolled Bond Beam Spa/45' weeping wall/tanning ledge/Jandy 2hp VS EPump/Jandy 2hp VS EPump feature pump
    1HP Booster/Polaris 280 Black Max/CL460 Filter/JXI 400,000 gas heater/2-Deck Jets/Auto Fill/Stenner 85MHP5 and 15 gallon Stenner tank

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    Re: Another Algae Thread

    FYI, finally got it to CC <.5 and 0 OCLT on Sunday morning.
    Completed October 31,2017
    16,125 gallon,IG, Stone Scapes Tahoe Blue Pebble/7' Rolled Bond Beam Spa/45' weeping wall/tanning ledge/Jandy 2hp VS EPump/Jandy 2hp VS EPump feature pump
    1HP Booster/Polaris 280 Black Max/CL460 Filter/JXI 400,000 gas heater/2-Deck Jets/Auto Fill/Stenner 85MHP5 and 15 gallon Stenner tank

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    Oly's Avatar
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    Re: Another Algae Thread

    What did you change? Give us idea of what the source may have been.
    27,000 gallons of central CA well water housed in a fiberglass coated concrete/plaster pool, dug into the most productive top soil on earth and surrounded by an urban forest.
    Cleaned with a Pentair 48 sq ft DE filter and Pentair Rebel suction side pool cleaner with large inline leaf canister. 250 gal Hot Springs Solana RX stand alone spa. Taylor K-2006. My first thread... New Old House, New Old Pool....

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