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Thread: Pool floor turned dark gray after shock

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    Pool floor turned dark gray after shock

    I put some shock in my pool and around the 3ft shallow area it turned a dark grey, almost black.

    I tried using a wire brush and the robot to remove it and it won't come off.

    I also have a Floatron and a electric heater.

    [attachment=2:3n5q5wec]ImageUploadedByTapatalk1375140070.228005.jpg[/attachment:3n5q5wec][attachment=1:3n5q5wec]ImageUploadedByTapatalk1375140092.549796.jpg[/attachment:3n5q5wec][attachment=0:3n5q5wec]ImageUploadedByTapatalk1375140102.577598.jpg[/attachment:3n5q5wec]

    It almost looks like a metal stain or something.

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    Mod Squad woodyp's Avatar
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    Re: Pool floor turned dark gray after shock

    Welcome to TFP. You just gotta KNOW we're gonna ask you to post up some test results to help, right? How do you normally sanitize the pool and what exactly did you use to "shock" with?
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
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    Richard320's Avatar
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    Re: Pool floor turned dark gray after shock

    Welcome.

    I would call that a metal stain. Tell us what you've been using to treat that pool. I'm willing to bet that somewhere in the past you used some sort of low-chlorine mineral sanitizer system.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Pool floor turned dark gray after shock

    I use Poolife TurboShock. I buy a huge jug of it for $250 and it lasts me about a year. And I have a salt generator, as well as the Floatron.

    That is the only shock I have used since I owned the house, which is about one year.

    Any ideas on what I should tell the guys pool place tomorrow? Or what to buy? I hope it goes away, looks terrible. Only thing I found high was my Ph.

    Something is telling me that this stain came from the Floatron, because it uses copper?

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    Richard320's Avatar
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    Re: Pool floor turned dark gray after shock

    Quote Originally Posted by Fonzi
    I use Poolife TurboShock. I buy a huge jug of it for $250 and it lasts me about a year. And I have a salt generator, as well as the Floatron.

    That is the only shock I have used since I owned the house, which is about one year.

    Any ideas on what I should tell the guys pool place tomorrow? Or what to buy? I hope it goes away, looks terrible. Only thing I found high was my Ph.

    Something is telling me that this stain came from the Floatron, because it uses copper?
    That would be a good assumption.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Pool floor turned dark gray after shock

    From the floatron website.

    The floatron unit utilizes a small photovoitaic panel to supply electricity to two electrodes. These electrodes then produce a combination of copper and other ions
    Those are VERY likely copper stains.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: Pool floor turned dark gray after shock

    How easy is it to remove these? Any particular products to ask for?

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    Re: Pool floor turned dark gray after shock

    You won't like the answers....copper is tough.

    Read the metal stain article under Solving Problems up in Pool School
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Pool floor turned dark gray after shock

    Wow. Definitely don't want to replace the water.. Well I'm stuck.

    I'll see if the pool place has anything, and also order this:

    http://www.amazon.com/BioGuard-Erase-Co ... B007ZU4DNS
    http://www.amazon.com/Blue-Stuff-Jacks- ... m_sbs_lg_4

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    Mod Squad Bama Rambler's Avatar
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    Re: Pool floor turned dark gray after shock

    Remember, it's the pool place that thinks copper is a good thing in your pool. Just saying!

    I can't find the msds for the erase product. Apparently you have to call them for one. Sounds kind of suspicious to me. It's probably ascorbic acid.

    Also keep in mind that once you have to sequester the metals it's an ongoing proposition. You'll have to add weekly doses of sequestrant to keep the stains from coming back. Just figure that into the equation when deciding whether to replace the water or not.
    Dave J. TFP Moderator
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    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Pool floor turned dark gray after shock

    Quote Originally Posted by Fonzi
    Wow. Definitely don't want to replace the water.. Well I'm stuck.

    I'll see if the pool place has anything, and also order this:

    http://www.amazon.com/BioGuard-Erase-Co ... B007ZU4DNS
    http://www.amazon.com/Blue-Stuff-Jacks- ... m_sbs_lg_4
    Jacks Purple stuff is recommended for Saltwater pools. http://www.amazon.com/The-Purple-Stuff- ... rple+stuff
    8638 gallon 20'x52" Intex ultra frame round AG. 2650 gph Intex Sand Filter. Intex krystal Klear SWG. (newer model that includes copper ion generation) Hayward 1091LX skimmer, Kreepy Krauly lil shark. Taylor K-2006 w/speed stir and sample sizer. New this year, Intex PureSpa - dichlor-> bleach method for sanitizing.
    New pool, 16'x36' (approx 18000 gal) in ground pool, Haywood DE filter

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    Re: Pool floor turned dark gray after shock

    Quote Originally Posted by Fonzi
    Wow. Definitely don't want to replace the water.. Well I'm stuck.

    I'll see if the pool place has anything.
    I am going to let you know, in no uncertain terms, that the recommendations you get at the pool place and here are going to be very different. We will give you advice that could be time consuming but is backed by science and hundreds of real world examples. The pool store will sell you a product. You are not going to be able to mix their advice and ours. Just keep in mind that their mindset (copper ions kill algae so it's a good thing!) is what caused this mess.

    We can help, of that there is no question. We can help you do it cost efficiently and effectively. The first thing I am going to tell you is take that bleeping Floatron out and throw it away. Next, aside of needing Jacks Purple Stuff (or preferably a water drain), what are your current test results?
    JD - 28' Round Above Ground Pool, 17,000 Gallons. Dual speed Jacuzzi pump with cartridge filter. Dual speed 1 HP pump, Hayward S210T sand filter
    Pool School - PoolMath - HIGHLY Recommended Test Kits

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    Re: Pool floor turned dark gray after shock

    Bought this: http://www.amazon.com/Natural-Chemistry ... 88-4730944

    Made the stain go away instantly. They didn't find copper. I thought since the pool was gunite it would be hard to remove, but it came off the second I put it in. Magic?

    I was hoping this would remove my algae (I think) stains too. The last owners of the house were an old couple and they paid someone to take care of the pool. Apparently they didn't do a good job.

    Here are the test results I got today:

    Free chlorine- 5.39
    Total chlorine- 5.39
    Cyanuric acid- 39
    Calcium hardness- 373
    Total alkalinity- 87
    Ph- 8.20 (Brought down to use the remover)
    Copper- 0.10
    Iron- 0

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    linen's Avatar
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    Re: Pool floor turned dark gray after shock

    Welcome to tfp, Fonzi

    Quote Originally Posted by Fonzi
    Ph- 8.20 (Brought down to use the remover)
    Is this correct? You do not want your ph that high especially with metals in the water. I would lower it down to 7.2 asap.

    Quote Originally Posted by Fonzi
    Bought this: http://www.amazon.com/Natural-Chemistry ... 88-4730944

    Made the stain go away instantly. They didn't find copper. I thought since the pool was gunite it would be hard to remove, but it came off the second I put it in. Magic?
    That is ascorbic acid (a very expensive version). The stains were either something else like iron, or you got lucky and had one of the "easier" forms of copper to remove. Bottom line is if you keep using the metal ions (floatron) you issue will likely appear again. Make sure you use a sequestrant to keep the metals from redepositing. By the way we highly recommend against metal ion systems...you are finding out why first hand.

    Quote Originally Posted by Fonzi
    I was hoping this would remove my algae (I think) stains too.
    If you have organic stains then raising your FC up a little bit (maybe 7-8 ppm) will slowly remove them. Make sure to lower your ph first (again down to 7.2) so that you do not exasperate your staining.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    techguy's Avatar
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    Re: Pool floor turned dark gray after shock

    Honestly, I think you got lucky. The Ascorbic Acid you bought was one of the things that the helpers were going to be suggest but I expect it would have been tried on a smaller scale before risking the whole pool. The methods recommended here are generally focused on safely fixing your pool and not risking your pool long-term.

    I hope you have good luck and decide which path you want to take as the BBB/TFP method and the pool store you shop at are polar opposites. Attempting to combine the two methods is a recipe for failure... and a ruined pool. Plaster finishes can be permanently damaged by one misstep.
    -- Guy --
    10K gallons in 21' Round 52 inch wall Aqualeader AG, Hayward Power Flow LX 1.5 HP pump motor, Hayward Perflex EC50AC DE filter w/Cellulose, Wide mouth skimmer, 2013 new Diver Dan (craigslist) to replace the faded old Hayward AquaBug. TF-100

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    Re: Pool floor turned dark gray after shock

    I've been looking around and the stains look like organic stains. I've been trying to get rid of them for a while now with shock. It wont do anything, they keep coming back. Adding a ton of shock to one area with the pump off and leaving it there for a few days helped some, but then again, they came back. It's like big and small patches of green that can't be brushed off. Then again, a lot of leaves and debris were left in the bottom of the pool when it came in my hands.

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    Re: Pool floor turned dark gray after shock

    I've been trying to get rid of them for a while now with shock.
    I thought you said the stains appeared WHEN you shocked?
    I put some shock in my pool and around the 3ft shallow area it turned a dark grey, almost black.
    ~16.5Kgal free form plaster with spill over spa
    1 1/2 HP Pentair SuperFlo pump, 1 HP Polaris QT Spa Blower, Pentair 48sqft DE Filter, PoolPilot Digital Nano+ SWG

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