Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 15 of 15

Thread: A friend with a strange problem?

  1. Back To Top    #1

    Join Date
    Jul 2011
    Location
    Mesa Arizona
    Posts
    190

    A friend with a strange problem?

    I have a friend that has a 15,000 gallon pool. DE filter and an SWG. Everything seems to be working normally but in the last 2 weeks, he is having a recurring problem with green slime on the walls of his pool. His PH has been a little high but he is keeping it in check with acid but his chlorine levels are fluctuating. His salt level keeps going UP? How is this possible?
    I'm beginning to suspect an edgy SWG unit but he just bought the SWG unit about 6 months ago but the head unit came with the house. The head unit says all is well except the high salt level.
    Any ideas?????
    Mesa Arizona. Old school 26,000 gallon in ground plaster pool with sand filter built in 1984.

  2. Back To Top    #2
    techguy's Avatar
    Join Date
    Jul 2010
    Location
    Antelope, CA
    Posts
    2,687

    Re: A friend with a strange problem?

    Do you have full test numbers? Sound like he/she could be fighting an algae bloom. If the CYA conditioner is too high, this could be very difficult to fight.

    Not knowing the numbers, I can't help.
    -- 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

  3. Back To Top    #3

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

    Re: A friend with a strange problem?

    We need the following test results: FC, CC, CYA, pH, CYA, TA, and CH.

  4. Back To Top    #4

    Join Date
    Jul 2011
    Location
    Mesa Arizona
    Posts
    190

    Re: A friend with a strange problem?

    His FC was 4 yesterday but it was .05 this morning. His PH is currently 7.5, CYA is around 50 and his CH is 200 or so. Sorry but I don't know his TA.
    His water is crystal clear and but he just is getting green slime in various areas on his walls and the mouth of the skimmer. If his walls are turning green, why isn't he getting an algae bloom?
    Mesa Arizona. Old school 26,000 gallon in ground plaster pool with sand filter built in 1984.

  5. Back To Top    #5
    Charlie_R's Avatar
    Join Date
    May 2013
    Location
    Mexico, MO
    Posts
    2,156

    Re: A friend with a strange problem?

    He is. It's just starting.

    Did you test the water with your TF-100 or K-2006, or are those pool store numbers?
    15'x48" 4500 gallon Intex pool, buried 1.5 ft. Pac-Fab Dynamo 3/4 hp pump. Hayward S180T sand filter, bought used. Taylor K-2006 test kit. Rocket mass heater based wood fired pool heater.

  6. Back To Top    #6

    Re: A friend with a strange problem?

    Need test results, but sounds like he will likely need to do the shock process and brush and brush and brush. Can you do the OCLT with him tonight so he can get going asap to have it still be clear for the holiday??
    POOL: Intex ultra new in 2014 (32 x 16 x 52) (seasonal; on concrete pad covered with 1.5" extruded or whatever foam insulation sheets - ugly, but comfy); added a through-wall skimmer; I add salt for feel. EQUIPMENT: Pentair SuperFlo pump (1HP, 2SPD); Pentair cartridge filter (200 sq. ft); Pentair MasterTemp natural gas heater (400,000 btu) Climate/Location: Eastern Nebraska

  7. Back To Top    #7
    dmanb2b's Avatar
    Join Date
    Apr 2009
    Location
    NY
    Posts
    3,728

    Re: A friend with a strange problem?

    Quote Originally Posted by crek31
    Can you do the OCLT with him tonight??
    Bingo...The OCLT should be done as soon as possible, and if needed start the shock process. After you are done shocking, you can raise CYA to 70pmm and maintain FC around 3-4ppm
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

    Pool School, TFTestKits, Pool Calculator

  8. Back To Top    #8

    Re: A friend with a strange problem?

    Don't forget to turn off the SWG for the OCLT.
    POOL: Intex ultra new in 2014 (32 x 16 x 52) (seasonal; on concrete pad covered with 1.5" extruded or whatever foam insulation sheets - ugly, but comfy); added a through-wall skimmer; I add salt for feel. EQUIPMENT: Pentair SuperFlo pump (1HP, 2SPD); Pentair cartridge filter (200 sq. ft); Pentair MasterTemp natural gas heater (400,000 btu) Climate/Location: Eastern Nebraska

  9. Back To Top    #9

    Join Date
    Jul 2011
    Location
    Mesa Arizona
    Posts
    190

    Re: A friend with a strange problem?

    He already started the shock process but I'm wondering why this has come up in the last week in the first place. His pool is always spotlessly clean and with an SWG, I don't think he should be getting any kind of algae. His water is still crystal clear. He is just getting spots of green on the walls even though he has a Barracuda and an SWG. It doesn't make sense to me. If the walls are getting slimy, I would expect there would be a severe algae bloom in short order but this has been going on for a week. I don't know if this can make a difference but he has a potassium based water softener that he does top off his pool with. He originally filled the pool with city water but uses the softened water to keep the CH in check. We have very hard water here in the Phoenix area.
    BTW, the test results are his. He has a decent test kit. The best available at Leslie's.
    Mesa Arizona. Old school 26,000 gallon in ground plaster pool with sand filter built in 1984.

  10. Back To Top    #10

    Re: A friend with a strange problem?

    I know people with spotless pools report they can get a little algae at the water line or in the back of the skimmer if they don't brush regularly. Does he brush the sides?
    POOL: Intex ultra new in 2014 (32 x 16 x 52) (seasonal; on concrete pad covered with 1.5" extruded or whatever foam insulation sheets - ugly, but comfy); added a through-wall skimmer; I add salt for feel. EQUIPMENT: Pentair SuperFlo pump (1HP, 2SPD); Pentair cartridge filter (200 sq. ft); Pentair MasterTemp natural gas heater (400,000 btu) Climate/Location: Eastern Nebraska

  11. Back To Top    #11

    Join Date
    Jul 2011
    Location
    Mesa Arizona
    Posts
    190

    Re: A friend with a strange problem?

    I didn't know it until yesterday but he never brushes it. He thought the Barracuda was all that was needed unless it missed a few areas. The Barracuda vac does work well in his pool but when I found out he has not brushed the walls in months, I told him that it needs to be brushed completely every now and then. At least once a week or more even though the pool is clean.
    Mesa Arizona. Old school 26,000 gallon in ground plaster pool with sand filter built in 1984.

  12. Back To Top    #12
    harleysilo's Avatar
    Join Date
    Mar 2012
    Location
    North Georgia
    Posts
    1,924

    Re: A friend with a strange problem?

    Just read another thread about something similar, maybe it the reflection of trees he's seeing....J/K but not really...
    18'x43' Sport Pool
    19,000 Gallons Vinyl Liner 3'-3.5'-4'
    SWCG and D.E. Filter
    Test Kits - Pool Calculator - Chlorine/CYA Chart - Pool School

    Secret Weapon for Pool Chemistry Testing

  13. Back To Top    #13

    Re: A friend with a strange problem?

    Quote Originally Posted by Mesamav
    His FC was 4 yesterday but it was .05 this morning.
    It's most likely a type of mustard algae due to low FC levels. For a CYA of 50, it is important to never allow the chlorine to go below 2.5 ppm (5 % of CYA for a SWG). If you do get algae, then you need to follow the full shock process.

    For insurance, I recommend an FC level in the 7.5 to 10 % for routine level after the shock process is complete.

    Note: 5 % is the absolute minimum. If the FC does go below that, you are probably growing algae.

    Your friend really needs an FAS-DPD test kit, such as the TF100 or K-2006. He should also get a salt test kit.

    http://tftestkits.net/TFTestkits-TF-100-p4.html

    http://tftestkits.net/Taylor-K-2006-p27.html

    http://tftestkits.net/K-1766-Taylor-Salt-Test-p31.html

  14. Back To Top    #14

    TFP Guide

    AimeeH's Avatar
    Join Date
    Apr 2012
    Location
    Columbia SC
    Posts
    1,837

    Re: A friend with a strange problem?

    Quote Originally Posted by Mesamav
    He already started the shock process but I'm wondering why this has come up in the last week in the first place. His pool is always spotlessly clean and with an SWG, I don't think he should be getting any kind of algae. His water is still crystal clear. He is just getting spots of green on the walls even though he has a Barracuda and an SWG. It doesn't make sense to me. If the walls are getting slimy, I would expect there would be a severe algae bloom in short order but this has been going on for a week. I don't know if this can make a difference but he has a potassium based water softener that he does top off his pool with. He originally filled the pool with city water but uses the softened water to keep the CH in check. We have very hard water here in the Phoenix area.
    BTW, the test results are his. He has a decent test kit. The best available at Leslie's.

    I didn't think I would have algae either.....SWG and crystal clear water. See this thread
    mustard-algae-t63844.html

    I'm sure I did now. I brought up to shock and brushed and brushed even on a clear day while hubby was floating on a raft. I realized my previous lack of brushing must have contributed. A week later I have scrubbed and brushed everything and water is clearer than when I though it was crystal clear before. I also have been adding DE to my sand filter. Now when I brush.....no cloud???? Really !! I'm still lowering FC to see if it comes back like mustard algae would. I certainly don't want that but if it is I will be here asking more questions here
    18*36*23 true "L" vinyl IG 29,000 gallons. SWG. TF-100 test kit.
    http://tftestkits.net/splash-page.html

  15. Back To Top    #15
    Patrick_B's Avatar
    Join Date
    Jun 2011
    Location
    Midland TX
    Posts
    15,001

    Re: A friend with a strange problem?

    Quote Originally Posted by Mesamav
    He already started the shock process but I'm wondering why this has come up in the last week in the first place. His pool is always spotlessly clean and with an SWG, I don't think he should be getting any kind of algae. His water is still crystal clear. He is just getting spots of green on the walls even though he has a Barracuda and an SWG. It doesn't make sense to me. If the walls are getting slimy, I would expect there would be a severe algae bloom in short order but this has been going on for a week. I don't know if this can make a difference but he has a potassium based water softener that he does top off his pool with. He originally filled the pool with city water but uses the softened water to keep the CH in check. We have very hard water here in the Phoenix area.
    BTW, the test results are his. He has a decent test kit. The best available at Leslie's.

    At some point or points his FC has simply been too low and it allowed Algae to grow...plain and simple. He does need to shock, brush and keep shocking until he kills it all. Can you help him through the process, and encourage him to get a FAS/DPD Kit for himself? He really needs it.
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

Posting Permissions

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