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Thread: Black Algae prevention after pressure washing

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    Black Algae prevention after pressure washing

    I have an older (1970) plaster pool that was nearly covered in black algae. The water was clear, but there was black algae all over the walls. I drained the pool and pressure washed every square inch, then sprayed chlorine on the pool surfaces twice, then refilled it. I've added baking soda, chlorine granules, stabilizer, and some chlorine tablets in the skimmer box. This was all done yesterday. My thinking is to maintain a high chlorine level in the pool with the hopes of the black algae being killed (if it's even still there). Any ideas or thoughts? Within the next month, I plan on installing an AutoPilot SWG.

    33K gal, IG plaster, 1.5 HP Hayward pump, sand filter

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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Black Algae prevention after pressure washing

    Welcome to TFP.

    If you'll follow the recommendations here you shouldn't have a problem with it again.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Join Date
    Jun 2012
    Howell, NJ

    Re: Black Algae prevention after pressure washing

    First step is to get one of the recommended test kits (linked to in my signature). After that, if you keep your chlorine at the proper level for your CYA, you should never experience algae.
    7 year old ~13,500 gal 24' AGP with 1.5 hp Proline pump, 150 sqft Pleatco cartridge, filled with well water with pH of about 4.5.
    Wanda the Whale pool vacuum, home made heater, Taylor K-2006
    Cloudy Pool? 1) Order test kit. 2) Follow SLAM
    New to TFPC? Read Pool School a few times, then post questions. PoolMath will help with chemical additions.

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    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Black Algae prevention after pressure washing

    I would add that keeping your chlorine levels above normal (say by 50%) is probably a pretty good idea for the first couple of weeks or so. You'll lose some extra chlorine but it may be good insurance. You can still swim safely anytime.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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