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Thread: algae problem or pool chemistry problem?

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    Join Date
    Jun 2015
    Suffolk, VA

    algae problem or pool chemistry problem?

    I've been battling low chlorine levels and thought my salt cell wasn't working but my PoolPilot says it is. Started seeing green/black spots on vinyl liner so manually brushed, shocked with granules calcium hypo. and vacuumed pool. Water looks clear but after shocking I see clumps floating on surface of water. Went through this routine a couple of times. Pool store says I have mustard algae so treated with yellow out and 4 lbs shock as directed. I keep seeing more dead stuff at bottom of pool but a few green/black spots still persisting. Now pool store tested for phosphates and said reading is over 1000. They sold me Phosfree but the instructions they gave me didn't match the label. Before I do anything else I figured I should ask you guys. I think my alkalinity is low for one thing and am worried about stabilizer levels. Also from previous posts think my chlorine still need to go higher. I have 27000 gal salt water vinyl lined pool.
    FC. 9.61
    TC. 9.61
    CC. 0
    pH. 7.6
    TA. 58
    CA. 26
    Ca hardness. 203

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    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: algae problem or pool chemistry problem?

    If you have visible algae, you need to SLAM your pool. What test kit did you use to obtain those results?

    Please read "The ABC's of Pool Water Chemistry" up in Pool School and then follow up with "SLAM" in the "How To" section up in Pool School as well.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3
    Mod Squad Texas Splash's Avatar
    Join Date
    Jun 2014
    South-Central Texas, Marion/San Antonio

    Re: algae problem or pool chemistry problem?

    Elrock, you sound like you're in the same position many of us were in before TFP - relying on the pool store. Simply put, they don't give the best advice. You cannot rely on their testing either. If you are considering following the TFP method to maintain your pool (which does work), you must do your OWN testing using one of the recommended kits (see the TF-1010 link below). Also take a moment to read the other links below. By following TFP, YOU do the testing (quite easy) and use minimal products (i.e. regular bleach) to keep your water crystal clear. You'll spend less $$ buying those "miracle products" and bags of shock at the pool store as well.
    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
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  4. Back To Top    #4

    Join Date
    Jun 2015
    Suffolk, VA

    Re: algae problem or pool chemistry problem?

    Thanks for your quick reply. The results came from the pool store. So you're recommending following through with SLAMming and then deal with the other numbers? I'm new to this forum and the whole TFP system so am a little slow to catch on.

  5. Back To Top    #5
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: algae problem or pool chemistry problem?

    Welcome to TFP!!!

    You need to invest in one of the Recommended Test Kits (The TF-100 plus the XL option from is the best deal since you have algae). And then test your water to determine where you are actually at.

    Then you will need to follow the ShockLevelAndMAINTAIN Process.

    While waiting for the test kit, take some time to read some of Pool School, starting with these:
    ABCs of Water Chemistry
    Recommended Pool Chemicals
    How to Chlorinate Your Pool
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  6. Back To Top    #6

    Join Date
    Jan 2014
    Buckeye AZ

    Re: algae problem or pool chemistry problem?

    1) stop adding anything the pool store sold you
    2) order a recommended test kit
    3) receive kit, do tests, post numbers here

    eventually, 4) get pH in line, add enough liquid chlorine to get to proper shock level, and keep adding to maintain that level. You will have a few days to read the ABCs and SLAM links while your kit arrives.
    10,500 gal IG, Topaz Pebble, auto-level
    Hayward DE filter, 2HP Ecostar VSP, ProLogic PS-4, GVA actuators
    Cal Pools Wave Force Plus (wall return jets plus 2 floor pop-ups), Venturi Skimmer
    Water sheer, 2 wok pots, bubbler stem on the baja step
    ColorLogic Mutlicolor LED lamp. Taylor 2006+speed stir

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    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    East Texas

    Re: algae problem or pool chemistry problem?

    An algae problem----IS-----a pool chemistry problem.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

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