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Thread: Red/Purple Algae?

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    Join Date
    May 2007
    Location
    Staten Island NY
    Posts
    113

    Red/Purple Algae?

    On Sunday I noticed a reddish/purpleish residue on the white trim of my pool light. Upon further investigation, I noticed this residue to be on one of my floor drains in the 6 foot section as well. Additionally, I noticed the liner to start feeling a little slimy.

    For the life of me, I cannot think of anything this color that was mistakingly or purposefully placed in the pool.

    Is there an algae that is is red/purple?

    My numbers are:
    FC 3.0
    CC <.5
    PH 7.6
    TA 110
    CYA 50

    I do not seem to be eating up unusual amounts of chlorine.

    My next course of action will be to bring the chlorine up to shock levels to fight this phenmenon and break down the combined chlorine. Just curious to see if anyone knew what I about to fight.
    -400 sq ft ingroung Fiji (straight back kidney) ~ 13,500 gallons - Vinyl Liner - 3 to 6 Feet
    -Hayward 1.5 HP Super Pump
    -Hayward Perflex DE Filter EC65A
    -Hayward H 250 Heater

  2. Back To Top    #2

    Join Date
    Mar 2007
    Location
    Coastalish 'down easter'
    Posts
    4,160

    Re: Red/Purple Algae?

    I've seen it!! I believe it's more a bacterial biofilm than algae, but the treatment is the same - shock to algae killing levels and hold there until there is no cc the next morning. You may want to think about raising your normal fc level, with what you describe, you may want to treat the pool as if it has black or yellow algae.

    Good luck and let us know how it works out!
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

  3. Back To Top    #3

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    duraleigh's Avatar
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    Apr 2007
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    Re: Red/Purple Algae?

    In addition to shocking, I'd physically remove as much as I could by brushing, scrubbing, etc. Expose more of it to the chlorine for a faster kill. I imagine there are thousand of types of algae and organic nasties that love to grow in your pool.....the answer is always the same.......chlorine.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  4. Back To Top    #4

    Join Date
    May 2007
    Location
    Staten Island NY
    Posts
    113

    Re: Red/Purple Algae?

    I didn't notice any Red/Purple residue last night but shocked anyway. As of this morning the Combined Chlorine is 0 and I lost about 1PPM overnight. I think I am in the clear. Thanks guys!

    BTW I have a solar cover and left it off since shocking to see what type of chlorine loss, if any I would have overnight. My question now is; should I leave the cover off during the day when super chlorinating? Does it matter? I can only guess that such high chlorine levels can cause damage to the cover????
    -400 sq ft ingroung Fiji (straight back kidney) ~ 13,500 gallons - Vinyl Liner - 3 to 6 Feet
    -Hayward 1.5 HP Super Pump
    -Hayward Perflex DE Filter EC65A
    -Hayward H 250 Heater

  5. Back To Top    #5
    frustratedpoolmom's Avatar
    Join Date
    May 2007
    Location
    SWSuburban Chicago, IL
    Posts
    11,963

    Re: Red/Purple Algae?

    I shock with my cover in place, I see no harm has come to it. My first cover lasted 5 seasons. I do think putting it on when shocking actually makes sure if theres anything trapped in the air bubbles it gets treated too.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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