Become a TFP Supporter Welcome to our new server and new forum software. Pool School
Results 1 to 6 of 6

Thread: Brown/Tan Looking Stuff in Bottom of Pool

  1. #1
    Member
    Join Date
    May 2010
    Location
    Mountain View, Arkansas
    Posts
    64

    Brown/Tan Looking Stuff in Bottom of Pool

    I have done everything possible to get rid of this stuff, that I know of anyway. Since following all the suggestions and using the BBB method I could not be happier with the results of my pool. It is very clear and shiny like I have never seen. I have used pantyhose in my skimmer baskets and have vacuumed to waste several times. Pool has been at shock level off and on for the past couple weeks to help kill everything. But after a couple hours or so after brushing and vacuuming this tan/brown stuff falls back into the same darn place in the pool everytime. I have to be careful when I vacuum because if I go to fast it just clouds up. It's only in a couple places in the pool.

    My numbers are as follows:

    TC 5
    FC 5
    CC 0
    pH 7.4
    TA 95
    CYA (Not sure-One pool store says 8, the other says 78) So I just assume its at 78 for now.
    Iron, Copper, Manganese (They say 0)
    CH 220
    Temp 80

    Could this be Mustard Algae since it keeps coming back in the same place? I know it's not dirt because it turns cloudy when touched.

    Sorry for the long post.

    Thanks
    Mountain View, Arkansas, 23,000 gallon in-ground concrete pool with a 24-in Hayward Pro-Series Sand Filter with side-mount. Chlorinator is attached but only use occasionally and a 1 hp pump.

  2. #2
    Member
    Join Date
    May 2010
    Location
    Mountain View, Arkansas
    Posts
    64

    Re: Brown/Tan Looking Stuff in Bottom of Pool

    And Borates are at 50.
    Mountain View, Arkansas, 23,000 gallon in-ground concrete pool with a 24-in Hayward Pro-Series Sand Filter with side-mount. Chlorinator is attached but only use occasionally and a 1 hp pump.

  3. #3
    Senior Member
    Join Date
    May 2007
    Location
    SWSuburban Chicago, IL
    Posts
    11,954

    Re: Brown/Tan Looking Stuff in Bottom of Pool

    Its probably just dust/dirt/pollen. It probably comes back to the same place because there are depressions of some sort where it's easy for it to settle.

    You can do an overnight test to confirm if you have organics. If the FC holds its probably not algae. Many, many folks confuse pollen/dirt/dust with Mustard Algae. Mustard algae grows on the walls, often on the shady side of the pool - and it will dissappear at shock levels, then can return as the FC drops to "normal". If you shock and see this stuff still it's prob not true MA.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

  4. #4
    Mod Squad zea3's Avatar
    Join Date
    Jul 2009
    Location
    Houston, Texas
    Posts
    5,088

    Re: Brown/Tan Looking Stuff in Bottom of Pool

    It could be small depressions in the surface where dirt collects. Mustard algae tends to grow in shady areas and along the sides. If you CYA is 78 then your FC is way too low. If your CYA is 8 then the FC will not hold. You may be keeping just enough FC to hold off a full algae bloom. I suspect the CYA is neither. You need a good test kit so you can check the chemicals yourself. Pool stores frequently use test strips or computer analysis to test CYA and those results are often inaccurate.

    According to the Pool Calculator, if your CYA is 78 your daily FC should be between 6 and 11 and you want to keep it on the high end as much as possible. You should never let the FC drop below 6. Your shock level is 21.
    TFP Moderator
    Helpful links: TF Test Kits,TFP Pool School, PoolMath
    Vogue 21" round AG, Pentair 1 hp 2 speed pump, 36 sq ft DE filter, Hayward S180T 150# sand filter, Houston, Texas
    Love TFP? Become a
    TFP Supporter!

  5. #5
    Member
    Join Date
    May 2010
    Location
    Mountain View, Arkansas
    Posts
    64

    Re: Brown/Tan Looking Stuff in Bottom of Pool

    It is definitely in the depressions near the shallow end. I retested my chlorine and FC is at 10. I will shock tonight and see if it goes away, but I do think last time I shocked stayed and didn't go away. I'll try again and see what happens. I am getting a good test kit from here the first of the month. I know I need it bad. The cheaper test kits and pool store testing are not very consistent nor do they seem very accurate. Till I can confirm what my CYA level is, will it hurt to keep my FC on the high side to be safe? Pool looks very clear and I have no smell of chlorine at all and the water doesn't burn the eyes. So I figure the balance is ok. I hope. Thanks for all the input
    Mountain View, Arkansas, 23,000 gallon in-ground concrete pool with a 24-in Hayward Pro-Series Sand Filter with side-mount. Chlorinator is attached but only use occasionally and a 1 hp pump.

  6. #6
    Mod Squad zea3's Avatar
    Join Date
    Jul 2009
    Location
    Houston, Texas
    Posts
    5,088

    Re: Brown/Tan Looking Stuff in Bottom of Pool

    My situation is a little different with an AG pool, but the floor is very uneven and any dust, dirt, pollen, ect that blows in settles in the depressions when the pump is turned off. Keeping your FC around 10 until you get a good test kit should be fine.
    TFP Moderator
    Helpful links: TF Test Kits,TFP Pool School, PoolMath
    Vogue 21" round AG, Pentair 1 hp 2 speed pump, 36 sq ft DE filter, Hayward S180T 150# sand filter, Houston, Texas
    Love TFP? Become a
    TFP Supporter!

Posting Permissions

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