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Thread: Is this algae?

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    Is this algae?

    Hi All:

    In-ground pool, 73.000 ltr (20.000 US gallon), Salt Water Generator, Sand Filter, tiles, cover.

    I had a guy maintain the pool the past year and half but since last October I have been maintaining it myself. I had some trouble keeping my FC in the charts (the test strip would always be white, indicating no FC at all) but I have added some cyanuric acid and now FC is within limits.
    Both pH, FC, Combined Chlorine, and TA are within limits. I have never used algaecide in my pool.

    However, a couple of weeks ago, I started seeing something that resembled sand in pool. I thought it was coming out of the inlets. Since my pool is always closed with the cover except when used, i know it was not coming from outside (e.g. Pollen). I would clean the pool and close it and it would reappear when i re-opened it.

    Eventually i managed to scoup some of this into a small bucket and took it out. Its soft to the touch (so it points to algae) and its color is brownish-reddish.. I snapped a few pics of this algae..

    I used algaecide and tried to keep the FC levels normal but that thing wont go away.. I can say that it slowed down the growth, but it keeps coming back... based on my research, it looks like its mustard algae.. any ideas?

    Many thanks
    Andreas
    Attached Images Attached Images
    Since July 2011,
    Inground 20.000 gallon, tiles, electric cover, Sta-Rite 1.5HP (5P6R6F-211) pump, Sta-Rite TM 31 sand filter, Zodiac TRi-22 SWG

  2. Back To Top    #2
    techguy's Avatar
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    Re: Is this algae?

    Reddish-brown soft debris in the pool is likely algae.

    I would add liquid chlorine to bring your pool to a shock level and start the SLAM process.

    SLAMMING Your Pool
    -- Guy --
    10K gallons in 21' Round 52 inch wall Aqualeader AG, Hayward Power Flow LX 1.5 HP pump motor, Hayward Perflex EC50AC DE filter w/Cellulose, Wide mouth skimmer, 2013 new Diver Dan (craigslist) to replace the faded old Hayward AquaBug. TF-100

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    Isaac-1's Avatar
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    Re: Is this algae?

    I agree likely algae, you should also invest in a good drop based test kit, I am not sure where your located so it is hard to suggest specifics, but if available I would suggest either the Taylor K-2006 or the TFTestkits TF-100, test strips are unreliable at best and completely misleading at worst, as their ranges are just too wide, and results are often too inconsistent if you are not very careful about testing.

    Ike
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
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    Butterfly's Avatar
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    Re: Is this algae?

    A full set of test results would help
    FC
    CC
    pH
    TA
    CH
    CYA

    Algae feels slimy, sand/dirt feels gritty, pollen feels soft/squishy.

    Pollen is often mistaken for mustard algae, since it often collects in very similar looking patches. Mustard algae tends to grow on the walls and floor of the pool on the shaded side. Pollen can look very much like mustard algae, but it will only settle on the bottom of the pool, not the walls, and appears everywhere, not just on the shaded side. Another way to distinguish between the two is that when you go up to shock level and brush the pool, mustard algae won't come back as long as you stay at shock level. Pollen continues to accumulate, even at shock level.
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

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    Richard320's Avatar
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    Re: Is this algae?

    Since you're using the demonic metric system... these links might help

    pool-test-kits-in-europe-what-i-learned-so-far-t52074.html

    where-to-buy-5-6-way-test-kit-in-canada-t59963.html
    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!

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    Re: Is this algae?

    Thank you all for your responses. I live in Nicosia, Cyprus (I bet $1 that most of you are jumping on a second window to Google this place )

    Just a few comments on what was said:

    - Unfortunately I do not own a proper test kit such as the K-2006. I read about it, but most of the US sellers will not ship it over (the ones who do, charge the same amount as its value for shipping).

    - I did not include values for FC, pH, TA etc, because I simply check if the color is within the limits. I can't remember the actual values.

    -Butterfly: I have now confirmed that it is algae, so what i need to do is treat it properly

    - Techguy: You said to use chlorine in liquid form. I dont think i can find this at the pool shop but i read about getting it from a supermarket (as long as I choose the one that does not contain any additional additives). Is that what you meant?

    Many thanks to all
    -Andreas
    Since July 2011,
    Inground 20.000 gallon, tiles, electric cover, Sta-Rite 1.5HP (5P6R6F-211) pump, Sta-Rite TM 31 sand filter, Zodiac TRi-22 SWG

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    techguy's Avatar
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    Re: Is this algae?

    Yes, here liquid chlorine is chlorine in a water solution with 10-12,5% chlorine by weight. We also have bleach which is the same with a strength of 3 to 8,25%. Most of the makers we recommend have the strength labels on the side of the bottle. We find if the maker does not label it, it means it. Is very low.

    Chlorox is the largest maker here.
    -- Guy --
    10K gallons in 21' Round 52 inch wall Aqualeader AG, Hayward Power Flow LX 1.5 HP pump motor, Hayward Perflex EC50AC DE filter w/Cellulose, Wide mouth skimmer, 2013 new Diver Dan (craigslist) to replace the faded old Hayward AquaBug. TF-100

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    Re: Is this algae?

    Quote Originally Posted by athan01

    - Unfortunately I do not own a proper test kit such as the K-2006. I read about it, but most of the US sellers will not ship it over (the ones who do, charge the same amount as its value for shipping).

    -Andreas
    I have sent you a PM with details of a supplier who did ship to me here in Italy at a reasonable cost. You have to email though and ask, their system does quote high shipping prices.
    400,000 Litre in ground infinity pool, with 40,000 litre holding tank (116 235.703 04 gallon). Vinyl liner.
    Two Astralpool Cantabric sand filters, 900mm diameter, each with 550kg of sand.
    Two ESI MP6 1.5kw 3 phase pumps.

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