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Thread: Fighting algae - nearing the end

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    Fighting algae - nearing the end

    After about a week of fighting my green swamp, I think I am nearing the end. The water is clear and the bottom is totally clean. I just added CYA today (was 0). Current values:

    FC 0.4
    CC 0.4
    pH 7.6
    TA 80
    CH 280
    CYA should go up to 50 soon
    Salt level is 3300

    Do I need to shock the pool as there is no FC or just wait for the SWG to do it's thing and for the CYA to be able to hold the FC? It's above 80 degrees today and sunny in Philly and will stay this way for the next few days.

    Oh - and one more things - I notices some foam floating on the surface of the water in the morning and dissolving during the day. Any idea?

    Thanks!
    Guy
    ~20k gallon IG plaster pool, Pentair 3/4HP Whisperflo, Pentair FNS Plus 48 DE filter, IntelliClor IC40 Salt Generator, Pentair Legend Platinum Robotic Cleaner

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    Re: Fighting algae - nearing the end

    It does sound like you are close but get some chlorine in there PRONTO. Do not wait for the SWG to produce it....put enough Clorox in to get to 6-8 ppm and then hold it there until you can get your swg up and running.

    The foam is a bit troublesome to me...are you familiar with the OCLT in Pool School? If so, take your FC up to about 8 ppm this evening and perform that test.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Fighting algae - nearing the end

    Thanks!

    I read about OCLT again and will try to do it, but I am not a morning person...
    In the meantime, I just added Chlorox to raise the level to 8 and will measure soon. Thanks!
    Guy
    ~20k gallon IG plaster pool, Pentair 3/4HP Whisperflo, Pentair FNS Plus 48 DE filter, IntelliClor IC40 Salt Generator, Pentair Legend Platinum Robotic Cleaner

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    Re: Fighting algae - nearing the end

    I added Chlorox yesterday, but was distracted by family activities, so I measured this morning only. Foam is gone, pool looks even more clear than yesterday. PH went down to 7 - not sure why...

    FC 4.2
    CC 0.4
    pH 7.0
    TA 80

    I probably need to take care of the PH and then measure CYA?
    Guy
    ~20k gallon IG plaster pool, Pentair 3/4HP Whisperflo, Pentair FNS Plus 48 DE filter, IntelliClor IC40 Salt Generator, Pentair Legend Platinum Robotic Cleaner

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    Richard320's Avatar
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    Re: Fighting algae - nearing the end

    Quote Originally Posted by guydot
    I added Chlorox yesterday, but was distracted by family activities, so I measured this morning only. Foam is gone, pool looks even more clear than yesterday. PH went down to 7 - not sure why...

    FC 4.2
    CC 0.4
    pH 7.0
    TA 80

    I probably need to take care of the PH and then measure CYA?
    I'd recheck that pH. It doesn't generally go down unless someone's adding something acidic, like acid or trichlor or dichlor. Did you just add the CYA?

    If you used liquid CYA, you can measure it within hours. Granular stuff will take a week or so, so save your reagent if it hasn't had time to dissolve.
    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: Fighting algae - nearing the end

    CYA (granular) was added yesterday at noon, so I am waiting... I checked the PH twice... strange.
    I will have to adjust and follow up, I guess. I am planning to use the pool for the first time today.
    Guy
    ~20k gallon IG plaster pool, Pentair 3/4HP Whisperflo, Pentair FNS Plus 48 DE filter, IntelliClor IC40 Salt Generator, Pentair Legend Platinum Robotic Cleaner

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    Richard320's Avatar
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    Re: Fighting algae - nearing the end

    Quote Originally Posted by guydot
    CYA (granular) was added yesterday at noon, so I am waiting... I checked the PH twice... strange.
    I will have to adjust and follow up, I guess. I am planning to use the pool for the first time today.
    Mystery solved. Head on over to http://www.poolcalculator.com/ and enter your pool volume up top. Then scroll waaaay down until you see Effects of Adding Chemicals. Plug in how much CYA you added and it will show you how much it will affect pH. Nifty, huh? Then go back up and let it tell you how much soda ash or borax to add to fix it.
    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: Fighting algae - nearing the end

    Thank you!!!
    I truly enjoy learning from this site! Pool is now officially open!
    Guy
    ~20k gallon IG plaster pool, Pentair 3/4HP Whisperflo, Pentair FNS Plus 48 DE filter, IntelliClor IC40 Salt Generator, Pentair Legend Platinum Robotic Cleaner

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