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Thread: Is it algae? Or just dirt?

  1. Back To Top    #1

    Join Date
    May 2014

    Is it algae? Or just dirt?

    Big fan of this site and the TFP method - 4 years!

    Pool is open - there is something on the walls (30k gunite) that looks like a shadow - a little darker than surrounding areas.
    It seems to brush off easily (well, brushing isn't really easy is it?) then looks like silt drifting in the water but the robo vac does not remove it.
    Waiting to see if it comes back.
    Can't really get a good pic.

    Is it dirt? Silt? Algae?
    Does anybody know of vacuum-powered/rotating/oscillating scrub brush that would make it easier to scrub the walls on a regular basis?

    FC 5.5
    CC 0.5
    Ph 7.6
    TA 95
    CH 150
    CYA 30
    30k gallon inground gunite, Pentair Intelliflo VS pump, Sta-Rite System 3 Catridge Filter, 2 main drains, 2 skimmers, 4 wall returns, 2 floor returns, 2 Jandy valves, 2 underwater lights (hey, I didn't design this thing...), LoopLoc safety cover for the winter, average chlorine usage over 3 years: 1.2ppm/day, using 12.5% sodium hypochlorite ($3/gal) and following TFP PoolMath directions. Works great!

  2. Back To Top    #2
    Mod Squad Texas Splash's Avatar
    Join Date
    Jun 2014
    South-Central Texas, Marion/San Antonio

    Re: Is it algae? Or just dirt?

    There are varying examples of each, but often times gritty is dirt, squishy is pollen, and slimy is algae. Green algae usually floats in the water and turns the entire pool a murky green. Mustard algae is a yellow green color and usually grows on the walls and floor mostly on the shady side of the pool. Pollen and dirt tends to accumulate in drifts on the floor in places with slower circulation and can often look fairly similar to mustard algae.

    In the end, the best way to know if you have an algae issue is to perform an overnight (OCLT) test. If you pass the OCLT, then you might look at other things like a skimmer sock, water circulation, etc.
    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
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  3. Back To Top    #3

    TFP Guide

    Join Date
    Jul 2015
    Central Valley CA

    Re: Is it algae? Or just dirt?

    Not sure about a powered brush but I have a Wall Whale that makes getting the walls much easier than a conventional brush. It's a simple idea that works great there's a fin on the brush head that helps push the head against the wall as you brush. If you get one I would go with the "classic version" because the tail is bolted on the brush head and could be possibly used on another brush when you wear the original out. It's a little over $30 on amazon for nylon or $65 for combo.
    12,300 Gallon, IG PebbleFina, 3 ft sheer, 2 Jandy nicheless LED lights, Jandy Pro 1.5HP VS pump (A.O. Smith Motor), PB4-60 Booster pump, Polaris 280, Jandy cv340 cartridge filter, Zodiac Z4 control panel W/iAquaLink, Stenner pumps for chlorine & MA connected to WiOn WiFi switches, TF-100. You can support TFP with AmazonSmile just click the link!

  4. Back To Top    #4

    TFP Guide

    bmoreswim's Avatar
    Join Date
    Jul 2012
    Central MD

    Re: Is it algae? Or just dirt?

    You may still be adjusting things as you start up for the season, but as a side note, I did notice that your CH is lower than recommended. I would raise that to 250-350 (range for a non-SWG pool - you may want to add your method of chlorination in your signature). Having it at 150 for a plaster pool for an extended period of time will cause the water to leach calcium out of our plaster, which can be problematic over the long term for your plaster's longevity.
    18'x38' Rectangle (3'-8 1/2' deep w/ diving board) - 27K gal. w/ gray plaster
    Hayward equipment (cartridge filter, 2-speed pump, SWCG, automation) View Our Build
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