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Thread: Is this algae, scale, or a combination of both

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    Is this algae, scale, or a combination of both

    This is my first post on the site, but I do want to thank everyone for their input to the forums. You really have helped this first time pool owner greatly.

    I bought this house last yr and the previous owner had a pool service that had the inline chlorine feeder maxed out year round. MY CYA was over 120 when I bought the house and Calcium was through the roof. I have since then got the chemistry inline and have been working on clearing pool surface stains since then. I use the chlorinator minmally and I chlorate with liquid chlorine (mostly) and powdered shock occasionally. My chemistry is below.

    PH 7.4
    FC 4
    TA 100
    CH 220
    CYA 60
    Current Temp 88

    20K gallon pool with spa and spillover. I run the pump 8-10 hrs in the florida summer. I replaced the propane Hayward heater last year after the flame tubes rotted out.


    The pool water is clear however I do battle with algae and high phosphates regularly. I feel like weekly I am brushing green algae off the bottom of the pool with a SS brush. If i brush hard enough I can get some of the brown streaks/scale to come off of the black pearl pebbletec finish. I have used Jacks Magic iron and cobalt remover per instructions with no success. I have tried the vitamin C tablet trick but did not notice much difference. Finally i dried sprinkling some dry acid on one of the pool steps and it seemed to take some of the brown away. I left it on there for only 5 minutes before brushing it off.

    My question: Is this calcium scale or some kind of hard algae that is causing these streaks in my pool? Is an acid wash or Jacks magic Copper and Scale stuff recommended? Any other recommendations?

    Attached are some pictures of my situation. 2.jpg1.jpg3.jpg6.jpg7.jpg
    20,000 gal in ground pool with spa and spillover. Built in 2000
    PebbleTec Black Pearl finish, 1.5hp Pump
    400,000BTU propane Hayward heater
    Hayward Starclear Plus c1200
    Caretaker 99 in ground floor cleaner

  2. Back To Top    #2
    Mod Squad kimkats's Avatar
    Join Date
    Jul 2012
    Location
    Tallahassee, FL
    Posts
    26,687

    Re: Is this algae, scale, or a combination of both

    You need to SLAM your pool! If you are brushing algae any at all you need to SLAM. Here is a link.

    Pool School - SLAM - Shock Level And Maintain

    THE more important part is the M=maintain as maintain the FC at the SLAM level for your pool CYA.

    Once you have SLAMed and passed the three "tests" we can work on the other stuff.

    Kim

    - - - Updated - - -

    OH and HI and welcome to TFP! Glad to see another Florida person one here.

    I love your plaster color.

    You did not say what test kit you have. How are you testing your water?

    Can you please add what kind of filter you have----sand, de, cart. THANKS!

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Casey's Avatar
    Join Date
    Apr 2007
    Location
    SW PA
    Posts
    10,157

    Re: Is this algae, scale, or a combination of both

    If your calcium was very high, it could very well be scaling. An acid wash maybe in your future. If you have algae or plums of algae when you brush, you should start the SLAM process.
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

  4. Back To Top    #4

    Re: Is this algae, scale, or a combination of both

    The previous owner did not care for the pool properly. When i bought the house, the calcium and CYA levels were through the roof. I have been trying to restore the pool ever since. When I brush really hard with the wire brush some brown does come off but its extremely difficult. I do not want to erode the finish with constant heavy scrubbing with the SS brush, not to mention it would take months to scrub the whole pool that way.

    When you say acid wash, are you talking about drain, wash, and refill or using a treatment that does not require draining?

    I have a cartridge filter and I used a K2006 test kit for chemistry
    20,000 gal in ground pool with spa and spillover. Built in 2000
    PebbleTec Black Pearl finish, 1.5hp Pump
    400,000BTU propane Hayward heater
    Hayward Starclear Plus c1200
    Caretaker 99 in ground floor cleaner

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