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Thread: Is this some sort of algae and should I be concerned?

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    keetman's Avatar
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    Is this some sort of algae and should I be concerned?

    Hi and thanks to all the good people here. I don't post much, but I somehow found this site 2 years ago as we were having our inground built. I have had great success with the methods taught here and because of this forum, when people ask me if having a pool is a lot of work...I can honestly say, "no".

    That said, I have a quick question. I don't think its much of a problem, but since I haven't seen it before, I thought I'd ask. I have a 16'x32' inground liner pool. It holds 13k-15k gallons of water, has a sand filter, a 1hp pump, 2 skimmers, main drain, and 2 returns. I also have an auto cover. I live in Columbus, Ohio and the fall was very wet and there was almost no snow this winter.....average temps were much higher than normal and there was very little freezing.

    When I opened the pool this year a couple of weeks ago, the water was fairly clear with a few leaves and worms...nothing major and actually better than last year. At the bottom I noticed a lot of large clumps of some sort of white solid. I vacuumed and ran the pump for a week or so, then this past weekend I vacuumed again. The clumps at the bottom were even more "clumpy". This stirred things up and the water became cloudy, but I backwashed the filter, cleaned all the baskets, and started shocking the pool. For three days now we've been running the pool over 20ppm FC. When I got home from work this morning, the pool actually looked pretty good. I'm going to have to vacuum a couple of more times and the shocking process isn't done, but I believe we'll get there shortly. Today's numbers were FC- 31 CC-4 (my wife put the bleach in yesterday morning while I was at work, because the levels were so high...I didn't add any this morning).

    Ok....here's the question, sorry it took so long to get here, but from what I've read....its easier to get help if you give more info! As I was looking at the skimmer boxes, I noticed a lot of that white "clumpy" stuff had accumulated around the box.

    Here's a pic:




    Any ideas as to what it is and what I should do about it? My strategy right now is to keep vacuuming, shocking, and cleaning the pool as per normal and as I'm able....get a brush in there to get that stuff into the skimmer and out of the pool. I don't see any build up anywhere else (other than the bottom, which really isn't "buildup"...just settling), so I believe its just dead algae or something else that has made its way to the skimmer, but not quite completed the journey yet. I'm not getting in the pool for a couple of weeks anyway because the temps still aren't there and the chemistry isn't quite right either, but I'm curious about this nasty stuff in my water.

    Thanks for any help or suggestions.


    Here's some more pics of the pool:




    19000 gallon in-ground
    18x37 Grecian
    Pentair SD80 Filter, Pentair Intelliflo Variable Speed Pump, Pentair Mastertemp 250 Heater
    Vinyl liner, Deck Jets, LED Color Lights, Typhoon Slide

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    Mod Squad Bama Rambler's Avatar
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    Re: Is this some sort of algae and should I be concerned?

    With a CC of 4 ppm it's most certainly algae. Have you felt of it? Does it feel slimy?

    Can you post a full set of test results, especially CYA and CH?

    How often are you testing and adjusting the FC?
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    keetman's Avatar
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    Re: Is this some sort of algae and should I be concerned?

    In a hurry, but I'm testing the chlorine and ph every day. Everything else I usually test on the weekends, but realize I'm still getting into the groove. After I posted that I did go test CYA as I figured it would be helpful....something weird is going on with the stabilizer though. The day I opened it, stabilizer was the first thing I added....I didn't measure it, but I added a "sockfull"....yea, not scientific......but it was fine all last season, so I got lazy....figured at least it would give me a start. Only thing was, after more than a week.....when I tested it Saturday it wasn't reading any CYA at all. So....I added more. I also just checked that again, although its only been a couple of days and the water is cloudy in the tube, but I can still see the dot. I'm probably going to have to get a better reading this weekend to know for sure where the CYA is at. Today's PH was around 7.3.

    Didn't feel it....didn't really want to. I'm a paramedic, have 2 kids, and 2 dogs.....I have to touch enough stuff I don't want to but have to..... I will in the name of science if you'd like me to though.
    19000 gallon in-ground
    18x37 Grecian
    Pentair SD80 Filter, Pentair Intelliflo Variable Speed Pump, Pentair Mastertemp 250 Heater
    Vinyl liner, Deck Jets, LED Color Lights, Typhoon Slide

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    Mod Squad Bama Rambler's Avatar
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    Re: Is this some sort of algae and should I be concerned?

    If you're only testing and adjusting once a day, you're not testing and adjusting nearly enough and it's going to take you forever and a lot of wasted bleach to get the pool clear. Also without any CYA 30 ppm FC is WAY too high especially for a liner pool. You're bleaching your liner.

    You need to test and adjust the FC as often as once an hour until it starts holding. Use the amount of CYA you targeted to figure your Shock level.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  5. Back To Top    #5
    keetman's Avatar
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    Jun 2010
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    Re: Is this some sort of algae and should I be concerned?

    Ok, I can do this. Thanks for your help.
    19000 gallon in-ground
    18x37 Grecian
    Pentair SD80 Filter, Pentair Intelliflo Variable Speed Pump, Pentair Mastertemp 250 Heater
    Vinyl liner, Deck Jets, LED Color Lights, Typhoon Slide

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