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Thread: New member with black stain in vinyl liner still learning how to post to the forum

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    Join Date
    Jun 2016
    Location
    East Peoria, IL
    Posts
    1

    New member with black stain in vinyl liner still learning how to post to the forum

    Hi,

    Water seemed perfect when leaving on short 4 day vacation.
    Returned, opened pool and had black stains??? Will try to attach photo...



    Water chemistry when we returned on 6/13/16 @ 2:07 PM:
    FCL = 9.23
    TCL = 9.59
    Br = 18.0
    PH = 7.3
    ALY = 147
    CH = 165
    CYA = 79
    Phosphates <100
    Water temp was 90F due to recent heat wave

    Tried PH reducer directly on stain; no noticeable effect?
    Added "Algestroy" provided by Central Pool
    Tried brushing today, 24 hours after adding algaecide... no joy!
    Read this article and thought I try some of those recommendations: Know Your Stains| Pool Spa News | Water, Metal, Cleaning, Spas

    Any thoughts?

    Thanks!!!
    Tom
    In Ground ~30,000 gallon 20' X 40' salt water pool
    Vinyl liner w/ 7' deep & 3' shallow ends
    Heated w/ sand filter, SWG and electric vinyl / canvas cover
    Bottom drains, two skimmers and built in white fiberglass ladder and steps
    Located in central midwest with lots of trees and related pollen in the spring

  2. Back To Top    #2
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,994

    Re: New member with black stain in vinyl liner still learning how to post to the foru

    First thing I would try is the Overnight Chlorine Loss Test to see if there is some algae growing. If you have a trichlor puck you can try rubbing the puck on the stain for a few minutes. If the puck helps then the stain is organic and elevated chlorine levels and brushing will help. You will need an FAS/DPD chlorine test. You can buy it by itself at TFTestkits.net or in a TF-100 test kit.
    TFP Moderator
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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