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Thread: Tiny bit algae - algicide needed or just shock?

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    Tiny bit algae - algicide needed or just shock?

    I have a SWG problem so my chlorine went to zero. By the time I discovered it the water was cloudy and I had a very small patch of algae (baseball size) in a corner on the tanning ledge.

    I've begun taking action by shocking it, and the pool has been consuming the chlorine like crazy.

    My question is, should I use algicide or just keep up the bleaching?

    Thanks!
    700 sq. ft./30,000 gal, gunite pool; 48 SF DE filter; 1.5 HP pump; Salt Water Generator; Solar Heat

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    Butterfly's Avatar
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    Re: Tiny bit algae - algicide needed or just shock?

    You should follow the SLAM process in Pool School to a T!

    Algaecide is only helpful in algae prevention, not cure.

    If you need help, post back and someone will be around to help.
    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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    Re: Tiny bit algae - algicide needed or just shock?

    Thank you!

    On my way over there right now...
    700 sq. ft./30,000 gal, gunite pool; 48 SF DE filter; 1.5 HP pump; Salt Water Generator; Solar Heat

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    Butterfly's Avatar
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    Re: Tiny bit algae - algicide needed or just shock?

    Quote Originally Posted by Bart View Post
    Thank you!

    On my way over there right now...
    You're welcome. Keep us posted
    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!

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    Re: Tiny bit algae - algicide needed or just shock?

    So far so good. Water is 100% clearer and very close to being back to normal.

    I cleaned my SWG which had some scale in it and restarted it. Hopefully, that was the problem that caused the cloudy water

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    Re: Tiny bit algae - algicide needed or just shock?

    So maybe I spoke too soon. Or maybe not.

    After a couple shockings and reshockings, I thought everything was back to normal so yesterday I restarted the SWG. I set it to 70, which is much higher than the normal setting.

    At the time the FC was 4

    It's now a day later and the FC is down to 3.

    There were only one or two people in the pool yesterday and it's been covered with a floating cover since yesterday evening.

    I started shocking the pool Friday night and have done it 3 and a half times since then. I just another shock.

    What do you think is going on? Is the SWG broken, or did I not do enough Slamming before turning the SWG back on?

    Here are the numbers from yesterday:

    FC 4
    pH 7.2
    TA 100
    CH 600
    CYA 62
    Temp. 85

    The FC today (24 hours later is down to 3). I also added some more CYA yesterday.

    Anyone have any idea what's going on?

    Thanks!!

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    Re: Tiny bit algae - algicide needed or just shock?

    I may have answered my own question by (duh) rereading the slam method and using the pool calculator.

    In order to bring my FC from 3 up to the proper SLAM level of 24, I need to add 1307 ounces of bleach! Or about 10 full sized jugs.

    I've been adding about 4 or 5 at a time thinking it was enough to get to 7 or 8 but not realizing I had to go all the way up to 24!

    Luckily I bought 12 jugs on the way home from work today!

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