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Thread: Algae Diary

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    Mod Squad JohnT's Avatar
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    Algae Diary

    Some folks just can't believe how quickly your pool can go through chlorine when you have algae, or that you can eliminate it with just chlorine. Due to major construction around my pool by a lousy construction crew (me ), I just got my pump and filter running yesterday evening. Big green mess. I don't have the main drain connected, so I can't vacuum. Here are my numbers and how things went. I'll update as it goes.

    4/30 5:30pm-Dark Green, Can't see bottom step. CYA 35 [Update: This reading was wrong, apparently caused by the algae and debris in the water. It is actually below 20], pH 8+, No chlorine. Raised Cl to 15.5ppm with bleach. Blind brushed bottom and hopper walls. Added some muriatic acid.

    4/30 8:30pm-Cloudy Dark Green, Can only see top step. Chlorine 4ppm, pH 7.8. Brushed some more and added bleach to go back to 15ppm. Added a little more HCl.

    4/30 10:00pm-Cloudy Dark green. Chlorine 10ppm. Added bleach to get back to 15ppm. pH 7.6. Laid off the HCl to see where the pH stabilizes.

    5/1 5:00am-Lighter Green. Can see all steps and can barely see dark places where I didn't brush in the shallow end. I can see the shallow/deep break line Filter pressure up 3psi, so I backwashed to maximize circulation. Chlorine 10ppm. Added bleach to bring it back up to 15ppm.

    5/1 4:30pm-Hints of Blue in the water. Much clearer and I can see the bottom and all of the brush marks, but no main drain. Probably covered with crud since it's not on. Chlorine at 8.5ppm. pH at 7.2. Backwashed, then added chlorine to get back to 15ppm. Brushed the whole thing.

    5/1 8:00pm-Cloudy again from the earlier brushing. Chlorine 12ppm. Pressure up 5psi so I backwashed again. More bleach and brushing.

    5/1 10:00pm-Dark, so no clarity or color report. Chlorine at 14ppm. Pressure up 3psi, but I let it go.

    5/2 5:45am-Noticably shifted toward blue-gray. If I could vac to waste, the water would probably be much clearer tonight. Chlorine at 8ppm. Backwashed and added chlorine to bring it back to 15ppm.

    5/2 4:30pm-I have a main drain! Blue gray and clearer. I could see all of the places I'd missed brushing, so I churned them up. Chlorine was 7ppm after a heavy rain. Took it back to 15ppm.

    5/2 10:00pm-Down to 9.5ppm. More bleach to 15ppm

    5/3 6:00am-Very much blue-gray. Backwashed for 4 minutes to help get rid of rainwater. Chlorine at 9ppm. Raised it to 15.

    5/3 9:00pm-Chlorine at 4ppm. Pressure up 5psi. Backwashed and added bleach. Brushed heavily.

    5/4 7:00am-Water cloudy but no color to it. Backwashed and brushed. Chlorine at 12ppm. Added chlorine

    5/4 10:00pm-Heavy rains all day. Chlorine at 6ppm. Added bleach and brushed.

    As of ~96 hours into the process, I've used 29.5 gallons of 6% bleach.

    The final few entries were lost in the forum switch. On May the 5th (I think) I reconnected the main drain which allowed me to start vacuuming. The improvement was pretty quick after that. I pronounced it absolutely clear on May 11th and returned the filter to timer control.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    And swimming season slowly returns to the midwest!!

    Do you have photos of the change? I saw some once on PF and they spoke volumes!

    8000 gallon 20' x 48" round vinyl frame pool, 12" sand filter (don't have the specs on the pump), TF100 test kit
    Handy Links: PoolMath, TF-100 Test Kit, Pool School, CYA-Chlorine Chart
    "Shock" is a process, not a product!

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    Mod Squad JohnT's Avatar
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    Quote Originally Posted by The Mermaid Queen
    And swimming season slowly returns to the midwest!!

    Do you have photos of the change? I saw some once on PF and they spoke volumes!
    No, I was too frazzled from all of the work I've been doing just to get to that point to worry about the camera. I thought about it as I was working, but I just didn't have the gumption to do it. The pictures showing change probably wouldn't have taken anyway because it was dark.

    Here's a link the the PF post with pictures.http://www.poolforum.com/pf2/showthread.php?t=1180
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Mod Squad JohnT's Avatar
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    Updated the original post.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    BTW, how's the MD line?
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

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    Mod Squad JohnT's Avatar
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    Quote Originally Posted by waste
    BTW, how's the MD line?
    I cut it and put in an expanding plug for now. The water in the pool was so bad I couldn't see the drain to try to cut down the flow. I had to get some circulation going, so I wimped out and plumbed the skimmer and return. There was an amazing flow out the pipe, and for just a second I was afraid I wouldn't get the plug in.

    Heavy rains today, so it may be several days before I go at it again. I know what to expect flow wise now for the worst case, and I THINK I can get a compression fitting on. If i'd planned a little better, I'd have ground down the metal part of the expanding plug so it was a little smaller, and I could have put the seal for the compression fitting on before I removed the plug.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Thank you John T This is the type of post I like to read not that you are having problems but you share with all in detail. This type of post helps me make a plan if I start to have a blum. Keep up the good work I have enjoyed reading all your posts. :P
    Ric W
    My Pool
    8605 gal fiberglass, 3/4 hp pump, sand filter, aquabot cleaner, heat siphon heat pump, tiger river(sumatran) spa

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