Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 11 of 11

Thread: Help I cant identify white substance

  1. Back To Top    #1

    Help I cant identify white substance

    I need help to identify a white almost bubble like substance on the bottom of my pool. It seems to gather in the low lying nooks crannys dips. I can touch it and it dissipates instantly. I have an above ground 24ft round chlorine, i use a de filter and when i vacuum the substance up it clogs my filter and i bump it and its ok for a while. Also my chlorine is dissipating at a extremely fast rate. Test result 24 hrs after super shocking with 3lbs of calcium hypochlorite 70% and 15oz of algaecide.


    Ph 7.0
    Tc .5
    Fc 0
    Hardness 500ppm
    Alkalinity 80ppm
    Cyan acid 0 (added 2lbs 48 hrs ago)
    Any all help would be greatly appreciated thanks

  2. Back To Top    #2
    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    Location
    SW Indiana
    Posts
    9,089

    Re: Help I cant identify white substance

    More than likely the remains of algae. You should never let your chlorine get down to 0.5ppm. You need to shock the pool and hold it there until it quits losing chlorine overnight. Shocking Your Pool
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

  3. Back To Top    #3

    Re: Help I cant identify white substance

    Ok let me retract all my test results, ( in hurry used strips, now in garbage) now retested using a taylor k-2005 test kit i have:
    Fc 1.5 ppm
    Tc
    Ph 7.4
    Ta 90ppm
    Ch 200 ppm
    Cya 14ppm


    Sorry for the previous test using idiot strips. Still have problem thanks

  4. Back To Top    #4

    Join Date
    Feb 2008
    Location
    Denton, TX
    Posts
    5,061

    Re: Help I cant identify white substance

    Welcome to TFP!

    How did you arrive at a CYA of 14?

  5. Back To Top    #5

    Re: Help I cant identify white substance

    Fill small cap tube with black dot until black dot not visible. O ok, I meant 140ppm.lol this is my third season with a pool and its been a struggle ever since. 1st season leaks, liner sags, 2nd season pink algae, burnt pump, this year dumped winter cover with a ton of leaves in pool, 1st year with hayward de filter (love it so far) now this white substance. Nothing floating crystal clear water, im ocd with keeping the pool vacuumed. Thank you so much for responding.

  6. Back To Top    #6
    UnderWaterVanya's Avatar
    Join Date
    Jun 2012
    Location
    Mint Hill, NC
    Posts
    2,589

    Re: Help I cant identify white substance

    140 CYA is the problem. The CYA makes a lot of your chlorine unavailable to fight algae and other nasties.

    Take a stroll through pool school and come back with questions - we can help.

    category.php?c=getting_started

    Sent via Tapatalk...
    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

  7. Back To Top    #7
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: Help I cant identify white substance

    Welcome!

    The stuff looks like waterborne dust bunnies, right?

    That's algae.

    FC is waaaaaaay too low for 140 CYA. And sadly, your estimate of 140 means it's probably more like 180, because the scale marks are not equidistant. There are directions for measuring CYA when it's really high in extended-test-kit-directions-t25081.html

    Get some chlorine bleach in there ASAP. Figure at least 4 jugs of 8.25% Chlorox -if CYA is only 140!!

    Then settle in and study pool school.
    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!

  8. Back To Top    #8

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,084

    Re: Help I cant identify white substance

    im ocd with keeping the pool vacuumed.
    If you will transfer a bit of that OCD over to managing and understanding your pool water chemistry, the vacuuming will become completely painless and your pool will be crystal clear.

    As others have posted, start up in pool school and learn to understand what your test results are telling you.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  9. Back To Top    #9

    Re: Help I cant identify white substance

    Cya is the problem. I cant swear by his science, but I once had a chemical engineer, who also owns a pool, tell me that F.C. for sanitizing purposes should be maintained at 11.7% of your CYA. Of course the disclaimer to that was "regardless of CYA level, never let F.C. drop below 1.5." In theory, if your CYA is 140, your F.C. should be 16.1 at minimum. For all practical purposes, the only way you can truly oxidize anything at that CYA level is with an Oxi shock.
    Even though it is not necessary in a properly maintained pool, you might want to use polyquat until you can get your CYA level down.

  10. Back To Top    #10
    linen's Avatar
    Join Date
    Jul 2010
    Location
    Twin Cities, MN
    Posts
    8,649

    Re: Help I cant identify white substance

    @ reynolds357....
    Quote Originally Posted by reynolds357
    Cya is the problem. I cant swear by his science, but I once had a chemical engineer, who also owns a pool, tell me that F.C. for sanitizing purposes should be maintained at 11.7% of your CYA.
    The experience on this board and others has shown that 7.5% (not 11.7%) of cya level is what is generally required to keep pools that don't have algae, algae free. See: http://www.troublefreepool.com/chlor...art-t2346.html

    Quote Originally Posted by reynolds357
    For all practical purposes, the only way you can truly oxidize anything at that CYA level is with an Oxi shock.
    I am assuming Oxi shock means Potassium Monopersulfate (mps)? Even at high cya levels, chlorine will still oxidize. MPS does oxidizes some stuff more efficiently, but in the typical residential pool, chlorine does the job for cheaper. See: http://www.troublefreepool.com/openi...11.html#p54096
    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.

  11. Back To Top    #11

    Re: Help I cant identify white substance

    Linen, I looked at the link you provided and "Target F.C." is 11.5%. That seems to harmonize pretty well with what the Chemical enginer's number of 11.7%.

    Chlorine will most definitely oxidize as long as there is enough of it free for the chemical reaction to occur. In high concentrations of Cyanuric Acid, it is definitely not operating in an efficient manner. What it all boils down to is the level of F.C. will have to be kept high for a much longer period of time than is convenient for most pool operators. Oxi Shock, or MPS can do in 30 minutes what Chlorine can take a couple of days to accomplish. I actually pay the same for MPS that I pay for Chlorine. I buy it in bulk when a supplier I know has it on sale. I do not like it good enough to use at $6.90 a pound, but its pretty good stuff for $2.80 per pound. I will conceed to you that MPS could definitely be seen as a short cut, but sometimes it is much easier to throw 2 lbs of MPS in the water than it is to go through a proper shocking procedure.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •