Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 7 of 7

Thread: Recurring algae on walls

  1. Back To Top    #1

    Join Date
    Jun 2013
    Location
    South Florida
    Posts
    117

    Recurring algae on walls

    This forum has been a wealth of information to me, thank you. I bought a home 1 year ago with a 10k gallon in ground pool. Pool was resurfaced by previous owner about 5 years ago with Daimondbrite.

    I have been maintaining the pool (with bleach) on my own, almost over obsessively. I use a Taylor K2006 test kit. The pool is open, full sunlight all day in south Florida. Test results are:

    FC: 7
    CC: 0
    CYA: 40
    TA: 70
    CH: 230
    PH: 7.4
    Borates @ 50ppm

    I never let FC drop below 5 and pass OCLT regularly. I brush every Sunday. Yet by the following Saturday, I continue to get a light bit of algae on the wall of my pool, particularly in the shallow end near the steps. The water is literally crystal clear, and I maintain water chemistry daily. So can anyone offer an explanation as why this keeps happening?

  2. Back To Top    #2
    Casey's Avatar
    Join Date
    Apr 2007
    Location
    SW PA
    Posts
    10,157

    Re: Recurring algae on walls

    Welcome to TFP. Is the Mustard on a shaded wall? If so, you may have to do a Mustard Algae SLAM until it clears and run a higher FC. I'd also brush your pool 2 times a week instead of 1x.
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

  3. Back To Top    #3
    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    Location
    SW Indiana
    Posts
    9,090

    Re: Recurring algae on walls

    Welcome to TFP!

    What color is the stuff you find on the wall?
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

  4. Back To Top    #4

    Join Date
    Jun 2013
    Location
    South Florida
    Posts
    117

    Re: Recurring algae on walls

    Quote Originally Posted by Casey View Post
    Welcome to TFP. Is the Mustard on a shaded wall? If so, you may have to do a Mustard Algae SLAM until it clears and run a higher FC. I'd also brush your pool 2 times a week instead of 1x.
    Hi Casey, the algae is on a wall that would be shaded early in the morning, but receives full sun the rest of the day. I have slammed twice over the past year, and the algae will recur usually within 3-4 weeks of slamming.

    Quote Originally Posted by JohnT View Post
    Welcome to TFP!

    What color is the stuff you find on the wall?
    I would say it is yellow/green in color.

  5. Back To Top    #5
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: Recurring algae on walls

    It sounds like poor circulation to me. Try re-aiming a return jet to cover the step area better. And brush the algae area more than once a week. A wall whale brush will move a lot of water. I mean, enough to bend the pole if you have it set to maximum thrust.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  6. Back To Top    #6

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,085

    Re: Recurring algae on walls

    I would say it is yellow/green in color.
    The color, combined with it's appearance on the walls indicates mustard algae. Does it "poof" into a yellowish-greenish cloud when you brush it? That also indicates mustard algae.

    I also have it in my pool in the same spots every year. Adequate chlorine (SLAM value for mustard) will remove it and keep it away but you have to monitor it carefully.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  7. Back To Top    #7

    Join Date
    Jun 2013
    Location
    South Florida
    Posts
    117

    Re: Recurring algae on walls

    Quote Originally Posted by Richard320 View Post
    It sounds like poor circulation to me. Try re-aiming a return jet to cover the step area better. And brush the algae area more than once a week. A wall whale brush will move a lot of water. I mean, enough to bend the pole if you have it set to maximum thrust.
    This has crossed my mind, but the circulation is very good in the pool, and the pump runs about 9 hours a day. There are two return jets at the opposite ends of the pool, and they create a nice circular flow through the pool. I'll double check the aim.

    Quote Originally Posted by duraleigh View Post
    The color, combined with it's appearance on the walls indicates mustard algae. Does it "poof" into a yellowish-greenish cloud when you brush it? That also indicates mustard algae.

    I also have it in my pool in the same spots every year. Adequate chlorine (SLAM value for mustard) will remove it and keep it away but you have to monitor it carefully.
    Yes, agreed it is Mustard algae. It definitely "poofs" when brushed. I may try a Mustard algae slam for an extended period.

    I don't think it helps that the pool is unscreened and susceptible to quite a bit of organics, including lawn clippings and constantly falling leaves.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •