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Thread: Solar blanket causing this slim?

  1. Back To Top    #1

    Join Date
    Apr 2016
    Location
    Tracadie, New Brunswick, Canada
    Posts
    35

    Solar blanket causing this slim?

    I have a 27' round OB salt water pool. We had a really nice hot weather since I opened the pool at the beginning of July and easily maintained 3ppm FC and 0ppm of CC with the salt generator running @40%. The temperature never went below 80f. So last Wednesday night was the last time I took my solar cover off my pool because thursday was cold and friday we left out of town and only arrived Sunday night. Monday was a cool day so we didn't use the pool so the solar cover had been on 5 days.

    This morning (Tuesday) I got up and took the solar blanket off and I vacuumed the pool but it was fairly clean with little debris and the water was clear but maybe not as crystal clear as it was a week ago but nonetheless very clear. I checked my chlorine and Ph with my taylor 2006k kit. I had 0ppm FC or maybe 0.2ppm as it had a very very slight pink color to it but I had 2-3ppm of CC indicating some sort of contamination. The Ph is 7.6 and the temperature was 74f. I checked my salt generator and visually inspected the cell and it was very clean except and little portion had some crystallization that I blew off mostly with compressed air. With the SWG in service you can see a slight cloud of chlorine like it did when it was new so I know that's not my problem. Then I passed my hand on the liner and it was slippery which indicates some sort of algae was in my pool. I brushed the floor and wall as best I could and shocked my pool with about 7L of bleach which brought the chlorine levels to about 7ppm measured after 3 hours or circulating.

    How high should I raise the chlorine for a proper shock is 7ppm enough? I have 3L of bleach left that would bring the FC to about 10-12ppm, should I dump it in before I leave tomorrow?

    The rest of my water tests as follows,
    FC 0-0.2ppm
    CC 3-4ppm
    Ph 7.6
    TA120
    CH 180
    CYA 60 (I was due to add a little conditioner to raise this but didn't yet)
    salt 3100ppm


    Did the solar blanket cause this algae outbreak? Someone told me that you should always take it off during the day so that the sun's ultraviolet rays can kill the bacteria that cause the algae? Is this true?

    We are leaving again tomorrow Wednesday and only returning Monday, should we leave the solar blanket off the whole time? Should I leave the pump running 24/7 till we get back? We don't yet have a leaf net so there is going to be leaves in it for sure when we get back.
    27' Above Ground Salt Water Pool (52"), 67380 Liters

  2. Back To Top    #2

    TFP Guide
    Mr Bruce's Avatar
    Join Date
    Mar 2014
    Location
    Greenville, SC
    Posts
    1,798

    Re: Solar blanket causing this slim?

    No, low chlorine caused your algae outbreak. If your FC is that low, it's a wonder the whole pool isn't green.

    Are you familiar with this chart? Pool School - Chlorine / CYA Chart
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

  3. Back To Top    #3

    Join Date
    Apr 2016
    Location
    Tracadie, New Brunswick, Canada
    Posts
    35

    Re: Solar blanket causing this slim?

    yes I am very familiar with the pool chart and every week I bring a water sample to my pool store for a complete analysis in addition to the bi-weekly tests that I do. Nothing has changed in my pool the whole summer and then all of a sudden over the course of 5 days my FC disappears and I have slime. The only thing that I can see is the fact that I didn't remove the solar blanket for 5 days.
    27' Above Ground Salt Water Pool (52"), 67380 Liters

  4. Back To Top    #4

    Join Date
    Jun 2016
    Location
    Los Angeles, CA
    Posts
    25

    Re: Solar blanket causing this slim?

    What test kit do you use? You're going to be told to ditch the pool store analysis which can't be trusted.
    TF-100 kit, SpeedStir, Sample Sizer. Still in early stages of pool planning

  5. Back To Top    #5

    Join Date
    Apr 2016
    Location
    Tracadie, New Brunswick, Canada
    Posts
    35

    Re: Solar blanket causing this slim?

    I'm using the Taylor 2006k test kit that is recommended here. I only test the FC, CC and Ph with my test kit because the CYA test uses up a lot of reagent and besides after the water is balanced the CYA is predictable and the TA and CH don't really change alot over the course of a week. I bring a weekly water sample to my pool store which have a very extensive water testing lab and also confirmed my FC and Ph findings.
    27' Above Ground Salt Water Pool (52"), 67380 Liters

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