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Thread: Crystal clear water - stubborn stain/algae

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    Crystal clear water - stubborn stain/algae

    FC 1.5
    PH 7.5
    CYA 45
    Hardness 160
    Alk 90

    The deep end of my pool has greenish/grayish stains or algae that cannot be brushed away. I tried an algacide and daily brushing but still nothing.

    We've had over 17 inches of rain this spring/summer in the event that has anything to do with it.

    Should I shock my pool again?

    Thanks in advance.
    25,000 gallon in-ground pool, Nautilus DE filter

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    pwrstrk's Avatar
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    Re: Crystal clear water - stubborn stain/algae

    That FC is below the min. It shouldn't go below 3 for very long. What is your CC ?


    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Mod Squad jblizzle's Avatar
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    Re: Crystal clear water - stubborn stain/algae

    You FC is clearly too low for your CYA: pool-school/chlorine_cya_chart_shock
    What is your CC?
    Is the water clear?
    What are you using to supply your chlorine?

    You may need to follow the SLAM Process due to the low FC.

    You can ID the type of stain by seeing if a trichlor puck will lighten it (organic) or if some crushed up vitamin C will lighten it (metal).
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: Crystal clear water - stubborn stain/algae

    CC - I need to get a better test kit.
    25,000 gallon in-ground pool, Nautilus DE filter

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    pwrstrk's Avatar
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    Re: Crystal clear water - stubborn stain/algae

    Bingo !!!!


    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: Crystal clear water - stubborn stain/algae

    Quote Originally Posted by jblizzle
    You FC is clearly too low for your CYA: pool-school/chlorine_cya_chart_shock
    What is your CC?
    Is the water clear?
    What are you using to supply your chlorine?

    You may need to follow the SLAM Process due to the low FC.

    You can ID the type of stain by seeing if a trichlor puck will lighten it (organic) or if some crushed up vitamin C will lighten it (metal).
    Water is perfectly clear.

    I use pucks in the skimmer basket and in-line chlorinator.
    25,000 gallon in-ground pool, Nautilus DE filter

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    pwrstrk's Avatar
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    Re: Crystal clear water - stubborn stain/algae

    You do know what those pucks do don't you ?


    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Mod Squad jblizzle's Avatar
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    Re: Crystal clear water - stubborn stain/algae

    I suggest further reading:
    ABCs of Water Chemistry
    Recommended Chemicals
    How to Chlorinate Your Pool

    I think the only reason your CYA has not gotten too high and resulted in a green pool is because you have gotten so much rain.

    You need one of the Recommended Test Kits and then you will be able to understand the water and determine if the SLAM Process is required.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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    Re: Crystal clear water - stubborn stain/algae

    Quote Originally Posted by pwrstrk
    You do know what those pucks do don't you ?


    Sent from my iPhone using Tapatalk.
    Nope.
    25,000 gallon in-ground pool, Nautilus DE filter

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    pwrstrk's Avatar
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    Re: Crystal clear water - stubborn stain/algae

    Quote Originally Posted by jblizzle
    I suggest further reading:
    ABCs of Water Chemistry
    Recommended Chemicals
    How to Chlorinate Your Pool

    I think the only reason your CYA has not gotten too high and resulted in a green pool is because you have gotten so much rain.

    You need one of the Recommended Test Kits and then you will be able to understand the water and determine if the SLAM Process is required.

    Just what jblizzle wrote. Good advice.


    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

  11. Back To Top    #11

    Re: Crystal clear water - stubborn stain/algae

    Just read about the pucks. Good times.

    While I wait for my new test kit to come in, should I SLAM my pool?
    25,000 gallon in-ground pool, Nautilus DE filter

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    Mod Squad jblizzle's Avatar
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    Re: Crystal clear water - stubborn stain/algae

    Pretty hard to do without the ability to test the CC or a FC > 5ppm.

    What did you use to get the results that you posted? You may be able to get a ballpark chlorine level with distilled water dilution until the kit arrives.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    Re: Crystal clear water - stubborn stain/algae

    It's going to be impossible to SLAM without the proper test kit.
    John
    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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