Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 4 of 4

Thread: Rivulets of black stuff

  1. Back To Top    #1

    Join Date
    Jun 2009
    Location
    Cedar Island NC (Outer Banks)
    Posts
    84

    Rivulets of black stuff

    Yes, I've asked variants of this over the years but it persists: I keep getting rivulets of something black on the bottom. We're not in a dusty area so I don't think it is dirt. The new SWG is keeping Chlorine great so I don't know how it could be algae esp with this data point: yesterday I vac'd to waste....perfectly clean bottom. In 90 minutes (!!!) the rivulets were back! The water is crystal clear sparkling. In past days I have vac'd using skimmer socks and don't find much.

    Ideas? Thanks, Steve

    Chlorine: 4
    Ph 7.3
    CYA 70
    TA 140
    Cedar Island NC (Southern Outer Banks)
    Splash Super Pool (40x20)
    29,000 gal; AG; Sand Filter; 1.5HP pump. Use the cosmic Taylor Test Kit
    New Aquarite SWG w/T-15 cell; New Dolphin Supreme M4 Robot cleaner

  2. Back To Top    #2

    In the Industry

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

    Re: Rivulets of black stuff

    Any pictures?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,347

    Re: Rivulets of black stuff

    Add a little DE to that filter and give it a couple of days and see if that helps a little. I bet it is dust.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  4. Back To Top    #4

    Join Date
    Jun 2009
    Location
    Cedar Island NC (Outer Banks)
    Posts
    84

    Re: Rivulets of black stuff

    Quote Originally Posted by Bama Rambler
    Add a little DE to that filter and give it a couple of days and see if that helps a little. I bet it is dust.
    That's what i meant to try...I'm a geezer and forgot this.

    Will report back.
    Cedar Island NC (Southern Outer Banks)
    Splash Super Pool (40x20)
    29,000 gal; AG; Sand Filter; 1.5HP pump. Use the cosmic Taylor Test Kit
    New Aquarite SWG w/T-15 cell; New Dolphin Supreme M4 Robot cleaner

Posting Permissions

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