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Thread: persistent blackish grout and daily gray settlement

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    persistent blackish grout and daily gray settlement

    Greetings fellow chlorinators,
    Being fairly new to the pool maintenance adventure and having inherited a sorely neglected pool I am getting a crash course, with the help of you all and Pool School, in many aspects of pool care and problem solving. I have had, so far, three algae blooms. All three instances undoubtedly due to my ignorance of proper chlorination.
    The formerly neglected pool is tiled with 1"x1" white tiles and in many areas the grout is dark looking. In a large circular area around the main drain the grout is white. (You can see the transition in the first pic.) I have been brushing the whole floor daily at least once and sometimes twice for weeks now with no improvement.

    Screen Shot 2015-07-23 at 6.00.21 PM.jpg

    Overall the appearance is blotchy and not particularly attractive. To make matters worse I have a daily precipitation of gray/green sediment which makes the darkish areas look black and furry. So I'm guessing (as always) that either the pool filter is recirculating the sediment or I have an ongoing growth creating it on a daily basis.

    Since the blooms I am keeping the FC above 5 at all times. That is based on my former CYA level of 60 which is no longer valid as it has fallen for some reason but my fear of algae has made me paranoid.

    I'm thinking I need a better brush. Is it Ok to use a partial SS brush on tile?

    Screen Shot 2015-07-23 at 5.58.29 PM.jpg
    25,000 Gal In ground
    Ceramic Tiled
    FKAA (Municipal) Water
    Sand Filter
    ! Hp No Name Pump K2006 Test Kit

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    Mod Squad kimkats's Avatar
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    Re: persistent blackish grout and daily gray settlement

    Any idea how old the pool is? What happens if you use a steel brush on the ones you can stand and brush towards the top? I would do a little experiment and see if:
    -it does any good.
    -does any harm

    Go from there.

    You can also put a puck on a spot and see if it does any good. You can also crush up some cheap vitamin C tablets, put them in a sock and let it sit on a spot and see what happens.

    Come back and let us know what you find out from the above.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: persistent blackish grout and daily gray settlement

    Quote Originally Posted by kimkats View Post
    Any idea how old the pool is? What happens if you use a steel brush on the ones you can stand and brush towards the top?
    Kim
    It's probably 30 something old. Sounds like a plan but I don't understand "the ones you can stand and brush towards the top" the discoloration is mainly on the floor

    I don't have a steel pool brush. I was trying to find out if it is OK to use one on tile and, if so, I was going to get one like this:

    Screen Shot 2015-07-23 at 7.26.38 PM.jpg
    25,000 Gal In ground
    Ceramic Tiled
    FKAA (Municipal) Water
    Sand Filter
    ! Hp No Name Pump K2006 Test Kit

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    Mod Squad kimkats's Avatar
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    Re: persistent blackish grout and daily gray settlement

    I don't know how rough/sharp/firm steel is on the a steel pool brush so this idea might not work.

    My idea:

    -get a "softer" steel brush like for a grill or such. Something small and cheap just so you can try it out. Since it is on the bottom of the pool duct tape it to a shoe and rub it on a small spot and use a mask to go down and see what it looks like.

    I like the idea of using the puck and V. c as it is easier and less work up front.

    I hope this make sense. I know with you being in the Keys you have a hard time shopping than us up here. I am trying to work with that in mind.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: persistent blackish grout and daily gray settlement

    OK, I have left a puck in the bottom for days with no effect.
    I wire brushed a small area and to get the black out I had to brush till I started damaging the surrounding tile finish.
    I have the vitamin C on my Grocery list.

    Why do you ask the pools age? Does grout discolor over time? (I know nothing)



    Quote Originally Posted by kimkats View Post
    Any idea how old the pool is? What happens if you use a steel brush on the ones you can stand and brush towards the top? I would do a little experiment and see if:
    -it does any good.
    -does any harm

    Go from there.

    You can also put a puck on a spot and see if it does any good. You can also crush up some cheap vitamin C tablets, put them in a sock and let it sit on a spot and see what happens.

    Come back and let us know what you find out from the above.

    Kim
    Attached Images Attached Images
    25,000 Gal In ground
    Ceramic Tiled
    FKAA (Municipal) Water
    Sand Filter
    ! Hp No Name Pump K2006 Test Kit

  6. Back To Top    #6
    Mod Squad kimkats's Avatar
    Join Date
    Jul 2012
    Location
    Tallahassee, FL
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    Re: persistent blackish grout and daily gray settlement

    I was just curious about the age as over time things do change. Who knows what they had done or NOT done before you got the pool.

    Too bad the puck did not do any good.

    Let us know about the Vit. C.

    Do NOT scrub with the steel brush anymore if it is causing damage

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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