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Thread: Is this algae?

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    Is this algae?



    I'm in the process of SLAMing in order to remove what I have perceived to be algae. I began the process yesterday, by adjusting the FC level to 20ppm (based on the shock level recommendations for my CYA level).

    I began the process around 3:15pm and checked the FC level approximately once an hour until night set. During that time the FC level remained at 20ppm. The pool was also completely brushed during this time.

    Unfortunately, I did not get a reading at dawn, but my 10am reading this morning FC level was 18.5.

    All readings have shown an CC level of less than 0.5.

    The picture above is what is currently collecting on the line between the shallow and deep end of the pool. The left hand side of the "material" is the slope into the deep end.

    What is this stuff? Is it living algae? Is it just dead material that needs to be removed and it collects easily on the top of the slope?

    While I'm at it, is there anything I can do to correct the bleeched out look at the edge of the floor and wall on the liner?

    Thank you.
    Pear shaped ? x 43', ~30K gallons | Vinyl Liner | ? HP Pentair pump | Hayward Sand Filter | (unused) Rainbow 320 Chlorinator | No automatic cleaner
    Someone once told me: There are two good days when a house has a pool; the day you move in and the day you move out.

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    techguy's Avatar
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    Re: Is this algae?

    I would say that is partially dead algae that sank to the floor and got trapped in the low spots.

    As to the bleached areas. Is it possible you dropped some chemicals (puck/granules) there?
    -- 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?

    Wouldn't dead algae come along with a larger drop in the FC reading?

    No pucks have been dropped into the corner of the pool. My wife threw one in the deep end a long time time ago, but otherwise pucks have either been in the skimmer or a float. Granual shock has always been the deep end of the pool and swept if it reached the bottom without dissolving.

    The following is a crude drawing of the shape of the pool:

    Code:
                                            A
                                        --------
                                       /           \
                                      /             \     B
                                     /               \
                                    /                 \
                                   /                   \
                                   |                   |   C
                                   |                   |
                                   \                   /
                                    \                 /
                                      --           --
                                         --------
    The bleaching in the corners of the wall and floors is only prevalent along walls A and B, but does seem to run the entire length of the two walls.
    Pear shaped ? x 43', ~30K gallons | Vinyl Liner | ? HP Pentair pump | Hayward Sand Filter | (unused) Rainbow 320 Chlorinator | No automatic cleaner
    Someone once told me: There are two good days when a house has a pool; the day you move in and the day you move out.

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    techguy's Avatar
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    Re: Is this algae?

    OK, it could be 100% dead. Break out a vacuum and vacuum it to waste.

    What is causing this "low area"? Is there something under the liner?
    -- 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?

    The material is positioned on the line that separates the shallow end of the pool from the deep end of the pool. Specifically, it is on the point where the pool begins to transition to the deep end.

    From the side it would appear as:

    Code:
         ----m
                 \
                  \----
    Where "m" is the material in question.
    Pear shaped ? x 43', ~30K gallons | Vinyl Liner | ? HP Pentair pump | Hayward Sand Filter | (unused) Rainbow 320 Chlorinator | No automatic cleaner
    Someone once told me: There are two good days when a house has a pool; the day you move in and the day you move out.

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    Re: Is this algae?

    It's dead algae (Don't ask me how I know ) Time to SLAM the pool.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Is this algae?

    I am in the process of SLAMing. I just have not noticed any chlorine drops that I expected.
    Pear shaped ? x 43', ~30K gallons | Vinyl Liner | ? HP Pentair pump | Hayward Sand Filter | (unused) Rainbow 320 Chlorinator | No automatic cleaner
    Someone once told me: There are two good days when a house has a pool; the day you move in and the day you move out.

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    Re: Is this algae?

    Sorry, William, I misread the first part of the thread.

    With your water almost clear and just that little bit of dead algae settling out, your chlorine consumption won't be that much....you are likely nearing the end.

    It's quite important to vacuum and brush at this stage to get up all the debris. Keep your FC up and you are getting very close to performing the OCLT and passing!
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Butterfly's Avatar
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    Re: Is this algae?

    Along with vac'g and brushing that area, maybe you can also aim some returns to better circulate the water in that area?
    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.

    ~ One should not use a sledge hammer to swat a mosquito. ~

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    Mod Squad Bama Rambler's Avatar
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    Re: Is this algae?

    That looks like south Alabama dirt to me!
    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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    Re: Is this algae?

    The pool has three returns. One return located in the shallow end (wall A in the diagram above). The other two are located in the deep end on the wall opposite wall C in the diagram above.

    The shallow end return I currently have pointed down and away from the skimmer (basically toward the other two returns).

    Both deep end returns are pointed down and toward the pool light (which is on the far end wall, I guess where one would expect it to be).

    Is this an appropriate return configuration or is there a standard setup that is considered "best"? I have the current configuration with the belief that pointing down will force better circulation for the bottom of the pool and away from the skimmers to create vortex formation such that debris will circle around to the skimmers.

    Is there a suggested method for validating that water circulation is effective?
    Pear shaped ? x 43', ~30K gallons | Vinyl Liner | ? HP Pentair pump | Hayward Sand Filter | (unused) Rainbow 320 Chlorinator | No automatic cleaner
    Someone once told me: There are two good days when a house has a pool; the day you move in and the day you move out.

  12. Back To Top    #12

    Re: Is this algae?

    It's close to South Alabama. Southern Missisippi, Hattiesburg area.
    Pear shaped ? x 43', ~30K gallons | Vinyl Liner | ? HP Pentair pump | Hayward Sand Filter | (unused) Rainbow 320 Chlorinator | No automatic cleaner
    Someone once told me: There are two good days when a house has a pool; the day you move in and the day you move out.

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    Mod Squad Bama Rambler's Avatar
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    Re: Is this algae?

    I get that same looking dirt in my pool. Pick some of it up and rub it between your fingers and see if it doesn't feel like dirt. It collects in creases and near seams.
    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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    Re: Is this algae?

    Dirt feels gritty or rough, algae feels slimy, pollen feels squishy. Scientifically speaking, of course.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    Butterfly's Avatar
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    Re: Is this algae?

    Is there a suggested method for validating that water circulation is effective?
    Well, you want it to go in a circular direction Try this:

    Aim all returns slightly downward and left (or right).

    You can test how well the circular motion is going with ping pong balls. They should go round and round the pool
    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.

    ~ One should not use a sledge hammer to swat a mosquito. ~

    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  16. Back To Top    #16

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    Re: Is this algae?

    ... and into the skimmer, and down to the pump, to the filter where it should stay (sung to the tune "Over the river, and through the wood,
    To Grandfather's house we go").
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

  17. Back To Top    #17

    Re: Is this algae?

    OK. I will try collecting some of the material, as it has collected in the same formation after vacuuming yesterday, and giving it a "scientific" rub between my fingers.

    I don't have any Ping-Pong balls laying around, I'll look for a suitable replacement and check the flow pattern.

    Thank you all.
    Pear shaped ? x 43', ~30K gallons | Vinyl Liner | ? HP Pentair pump | Hayward Sand Filter | (unused) Rainbow 320 Chlorinator | No automatic cleaner
    Someone once told me: There are two good days when a house has a pool; the day you move in and the day you move out.

  18. Back To Top    #18

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    Re: Is this algae?

    ... and into the skimmer, and down to the pump, to the filter where it should stay (sung to the tune "Over the river, and through the wood,
    To Grandfather's house we go").
    At last, chem geek is getting down to my comprehension level

    (Ya' know, now that tune is stuck in my head and I'll be humming it tonight when I dose )
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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