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Thread: Algae or filter not filtering?

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    Join Date
    Aug 2015
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    Livingston, la
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    Question Algae or filter not filtering?

    My water started looking a touch cloudy sunday. I checked my levels and they were
    fc 7.5
    cc 0
    Ph 7.2 ( had added ma to get ta down)
    Calcuim hardness 60ppm
    Cya 60 ppm
    Backwashed pump and added 16 oz cal/hypo because water was starting to get cloudy and i was expecting swimmers.

    Tuesday it looked even more cloudy.
    fc 8
    cc .5

    Today it was really cloudy... Like algae bloom cloudy, but my cc was only .5 so i added 1 cup cal/hypo and went to work. Got home and it was cloudy green. Or dirty.. Backwashed my filter again just incase it was dirty. Took readings
    fc 10ppm
    cc .5
    ph 7.2

    backwashed and put 1 more cup cal/hypo. Im so confused because i thought if the cc was low that it meant nothing was eating up the chlorine... Im doing the test exactly like the instructions said. I have never gotten high cc readings but my water was always clear until sunday. I have obviously dirty water and my combined chlorine is only .5??? Help!!!! Im wonding if my filter is not filtering.... Even tho it has been for about a month since i took the cover off! Changed the sand last year and changed the spider gasket/ valve on the miltiport. Im really scratching my head...
    18x33 partially burried AGP
    sand dollar sd60 filter
    1.5 doheny inground pool pump

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    lefty51's Avatar
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    May 2015
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    East of Royals country western MO
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    Re: Algae or filter not filtering?

    Hi,
    It sounds like the start of an algae bloom. Try doing the overnite test to see how much FC drops overnite. The low CC could be that the algae is just starting to take hold. Don't know what effects cal/hypo might have on cloudiness.
    If it were me I would do a SLAM according to what pool math says your SLAM level should be. I would do it with just plain old bleach. And when you pass the OCLT with clear water you should be ok.
    Si -central Mo. 32' x 16' -- 3'4" to 6' deep Vinyl liner - 16,500 Gals : Triton II filter -Duraglass 2 hp pump - 1 speed : SI-30 salt generator
    TF-100 with speedstir

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    Mod Squad tim5055's Avatar
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    Re: Algae or filter not filtering?

    Yup, Overnight FC Loss Test (OCLT) will show if there is a problem
    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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    Aug 2015
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    Livingston, la
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    Re: Algae or filter not filtering?

    Ok.... Did the oclt last night. At 9pm my ppm was 11.5 fc and .5 cc. I tested it this morning and it was 12 fc and .5 cc. (I had added a cup of cal/hypo at around 6pm the night before, so im thinking it didnt finish disolving and thats why my fc went up.) Not sure. I could cry! Its cloudy green so i went ahead and added 2 lbs of cal/hypo. I also added a dose of clarifier. Its been running since noon. Im going to do the oclt again tonight. Thanks for yalls help!
    Attached Images Attached Images
    18x33 partially burried AGP
    sand dollar sd60 filter
    1.5 doheny inground pool pump

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    Texas Splash's Avatar
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    Re: Algae or filter not filtering?

    Melgrace, that's a nice pool, and we want to see it crystal clear for you. My biggest piece of advice right now .... stop using the cal-hypo for the moment, find a good place to buy regular bleach, and rely only on that right now to maintain your required SLAM FC level. It's easy and very effective. Your last CYA was 60, so your SLAM FC should be 24. If you maintain that FC of 24 all day & night with "regular/plain" bleach as much as possible, while following all of the other items noted on the SLAM page (link below) you will be amazed at the transformation. But you must do everything on the page, and don't stop until you pass ALL 3 SLAM criteria. Do not add any more clarifier or pool store products hoping for an overnight cure. It didn't get algae overnight, so it won't go away overnight, but YOU CAN fix it with bleach. Hang in there!

    - - - Updated - - -

    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.
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    lefty51's Avatar
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    Re: Algae or filter not filtering?

    Hang in there Melgrace,

    Pat beat me to your SLAM numbers. See it's great having these knowledgeable folks on here with accurate numbers and procedures. Take it from me, they led me every step of the way and I've had a pool for a long time.

    Please do as he says and follow the SLAM steps faithfully and you will be swimming in no time. NO shortcuts! Also what he said about plain old bleach and no xtras. And remember to brush and vacuum! It will start turning clearer by the day. But also remember you may get to a point that it looks almost perfectly clear and you will think it's not progressing anymore. IT is even if it looks like it's not. As he said, it didn't get that way overnight(even if you thought it did) and it won't clear in a day, BUT it will work. Hang in there
    Si -central Mo. 32' x 16' -- 3'4" to 6' deep Vinyl liner - 16,500 Gals : Triton II filter -Duraglass 2 hp pump - 1 speed : SI-30 salt generator
    TF-100 with speedstir

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    kcindc's Avatar
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    Re: Algae or filter not filtering?

    You have been given good advice... one more thing to consider. You should only backwash when your pressure rises 25% above your clean pressure (just backwashed pressure). Sand filters do a better job when they are slightly dirty. Hang in there!
    Karen
    33K IG w spa plaster, Pentair 1HP Whisperflo, DE Filter, SWG CircuPool RJ-60, Dolphin Triton Plus, Raypak Dig 336K BTU, TF-100.
    Pool Math Chlorine / CYA Chart SLAM - Shock Level And Maintain
    2017 replaster/retile

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