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Thread: Green "algae" on the bottom, but clorine levels are good??

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    Green "algae" on the bottom, but clorine levels are good??

    I just tested:

    FC: 3.5
    CC: 0
    PH: 7.8
    TA: 120
    CYA: 40
    24x12 AG, 8000 gallons

    It kinda just looks dirty (and it might be?), but I just vaccumed 3 days ago. I've been testing every day, and adding bleach. I just added 32 ounces of bleach and turned the filter on high, just to stir it up some. It is kinda windy today, and my husband is stirring up lots of saw dust working on the deck. Maybe I'm just paranoid, but my water has been CRYSTAL clear since I started this pool a month ago with BBB. We had a LOT of rain last week, but I've been treating it when the levels get low.

    Any suggestions?

    Yvette in Burleson, TX
    AG 54" 12x24 partially buried

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    Mod Squad jblizzle's Avatar
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    Re: Green "algae" on the bottom, but clorine levels are good

    Raise the FC to 10ppm and do the OCLT and then you will know if it is consuming FC and thus need to SLAM the pool.

    A FC of 3.5ppm is pushing the minimum
    Jason, TFP Moderator
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    Re: Green "algae" on the bottom, but clorine levels are good

    What is OCLT??
    Yvette in Burleson, TX
    AG 54" 12x24 partially buried

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    Mod Squad jblizzle's Avatar
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    Re: Green "algae" on the bottom, but clorine levels are good

    Perform the Overnight Chlorine Loss Test

    And before you ask: [slam:r1ap9tol][/slam:r1ap9tol]
    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: Green "algae" on the bottom, but clorine levels are good

    AWESOME! Hadn't heard about the OCLT, but totally makes sense. Thanks for the links. I'll go test again in 30 minutes, and in the morning, and see what's up! Thanks again!!
    Yvette in Burleson, TX
    AG 54" 12x24 partially buried

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    Re: Green "algae" on the bottom, but clorine levels are good

    Ok, fc was 6.5. Now I'm interested to see what it will be in the morning.
    Yvette in Burleson, TX
    AG 54" 12x24 partially buried

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    Mod Squad woodyp's Avatar
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    Re: Green "algae" on the bottom, but clorine levels are good

    .............BE4444444444444444444444..................Sunri se! Set your alarm!
    Nice deck build in progress there btw.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
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    Re: Green "algae" on the bottom, but clorine levels are good

    Looks like you're going to have a nice shady spot for those that want to sit and watch while the others play. Nice set up!
    Indiana, ABG 24'x52" Galveston by Blue Cascade (Craigslist buy w/part of deck included), 13,500 gallons, Intex SWG, solar panels mix 2, TF-100 test kit.

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    Re: Green "algae" on the bottom, but clorine levels are good

    Well, the fc is 6 this morning. I ran my vaccum all night, and got in the pool and kicked up the bottom. So, I guess I don't have a problem?

    Thanks for the Compliments on the deck. My husband is working really hard on it. He's never done anything like this before. We'll have two steps up to a 4 foot platform level with the pool.
    Yvette in Burleson, TX
    AG 54" 12x24 partially buried

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    Charlie_R's Avatar
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    Re: Green "algae" on the bottom, but clorine levels are good

    My pooi is partially shaded by two trees, and we have dogs that like to swim. My daily routine includes sweeping the pool to stir up what has settled out at night, and netting all organics (leaves etc.) that have fallen into the pool. Every other day I have to vacuum to get what hasn't been filtered out from the sweeping.

    What type of filter do you have? If it's a cartridge, you can check the filter for what color the crud is on the media. If it's a sand, capture some of the backwash water in a clear container and let it settle out. Either of these will tell you if it is just dirt and/or construction debris, or anything else that is getting filtered out.

    You can also smear a little of whatever it is on s piece of white paper or card to check the color.

    However, the OCLT is the definitive test for anything in your pool that would consume FC. So, if your water is clear; CC=<.5; and FC loss =<1, you have passed the test.

    Sawdust, being a wood byproduct, is an organic that can be broken down by chlorine. It might be a good idea to use the vacuum on a daily basis while your deck construction is ongoing.
    15'x48" 4500 gallon Intex pool, buried 1.5 ft. Pac-Fab Dynamo 3/4 hp pump. Hayward S180T sand filter, bought used. Taylor K-2006 test kit. Rocket mass heater based wood fired pool heater.

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