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Thread: Sediment

  1. Back To Top    #1

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

    Sediment

    Problem: sediment settles on the bottom a few hours after vac (either to waste or recirc with some panty hose over the returns...can't see anything in the hose)
    Comments:
    • Water is sparking, perfectly clear
      I had a busted pipe in the sand filter 4 weeks ago so got a new insert and new sand. Filed the sand as per pool school. I'm positive nothing wrong there. I see nothing spurting out of the returns and the hoses don't reveal anything.
      Sediment is brownish. Do not get poofs of green when vac'ing...in fact it doesn't poof, at all.
      Our water does have a lot of iron in it but have not added much in a week or so.
      The sediment has stained the bottom of the pool in a lot of places. So, far can't get rid of them.
      I have lots of areas with a fine sandpaper like finish on the side. Difficult to impossible to scrape off.
      I just added 1 gal of muratic per the Calculator to get the TA down, and have the returns pointed up so I get surface action.
      I just added 2 gal of 12% chlorine per the Calculator to get it up to about 14.


    What can I do to stop this sediment coming back...it happens within a couple of hours after vac so it cannot be growing that fast.

    Once I stop that, how can I get rid of those stains? That's a lot of ascorbic acid

    The numbers (before I added the aforementioned chlorine and acid):
    FC 6
    CC 1
    PH 7.6
    TA - Total Alkalinity 250
    CH - Calcium Hard 275
    CYA - 35

    Thanks in advance! Steve
    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
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,333

    Re: Sediment

    With a CC of 1 ppm it's most likely algae that's dying and falling to the bottom. You're killing it fast enough to keep from turning green but not fast enough to get rid of it. You most likely need to shock.
    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

  3. Back To Top    #3

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

    Re: Sediment

    Quote Originally Posted by Bama Rambler
    With a CC of 1 ppm it's most likely algae that's dying and falling to the bottom. You're killing it fast enough to keep from turning green but not fast enough to get rid of it. You most likely need to shock.
    Well Bama, hat's off to you. I was leaning towards iron in the water. I had already brought it up to 15 and lo and behold this morning, there was very little sediment. I boosted it again at noon and brushed...very little there. And, that shock level has taken care of the stains on the bottom and sides that I had mentioned. Friend at the pool store (she knows I do BBB) says it is mustard...described the residue perfectly. So, I'll keep it at shock until it passes the over night test.

    Many thanks for the help. Steve
    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

  4. Back To Top    #4
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,333

    Re: Sediment

    I doubt it's mustard algae, but that doesn't change your plan of attack. Keep at it till you pass the OCLT.
    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

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