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Thread: Black stain removed with puck (and mothballs?)

  1. Back To Top    #1

    Join Date
    Jul 2008
    Location
    Seacoast, NH
    Posts
    248

    Black stain removed with puck (and mothballs?)

    The inside of my skimmer has black marks above the water line. I tried scrubbing it with a dish brush I bought for tough to reach spots in the pool and they didn't budge. I'd read on here that pucks can remove some stains, so I tried it. I have a small bucket of pucks I use at the beginning of the season when my CYA is near zero and the water is too cold for the SWG.

    The puck removed the stain. Now two questions:

    1. What does it mean that the puck removed the stain? Does it mean it's algae or just that it needed to be bleached out?

    2. The pucks are stored in the shed. We put some mothballs in the shed to keep the mice away who had chewed 3 holes in our winter cover last summer. The puck started to stink of mothballs once it got wet. It continued to smell (of both chlorine and mothballs, an awful combo) the entire time I used it. Do you think there's a problem? Did I just put the equivalent of a mothball in my pool and, if so, is it an issue?

    Thanks.
    19,000 gallons, Well Water
    Stay-Rite System 3 Cartridge filter
    IG vinyl, MasterTemp 400 Propane heater
    Intellichlor 40 SWG, 2006 Taylor Test Kit with Speed Stirrer
    1.5 HP Pump

  2. Back To Top    #2
    JoyfulNoise's Avatar
    Join Date
    May 2015
    Location
    Tucson, AZ
    Posts
    11,621

    Re: Black stain removed with puck (and mothballs?)

    Either move the chlorine tablets or the mothballs, they should not be in the same shed. Mothballs contain naphthalene which is a solid that sublimates naphthalene vapors at room temperatures. Those vapors can easily condense back into solid form when it cools and it is likely they can get to the chlorine tablets. Poly-chlorinated naphthalenes (there's about 75 different PCN compounds possible) can form in a variety of ways and are hazardous compounds that you should avoid exposure to. So simply move one of them somewhere else.

    The dark stains on the skimmer are just organic compounds. Nothing to worry about. I use a Mr. Clean Magic Eraser sponge to clean the discolorations off. Works like charm every time.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

  3. Back To Top    #3

    Join Date
    Jul 2008
    Location
    Seacoast, NH
    Posts
    248

    Re: Black stain removed with puck (and mothballs?)

    Thanks.

    Now I'm wondering what to do with the remaining pucks that now smell like mothball, so I assume hazardous stuff may have already formed. Safe to just use them? I need to raise my CYA anyway.
    19,000 gallons, Well Water
    Stay-Rite System 3 Cartridge filter
    IG vinyl, MasterTemp 400 Propane heater
    Intellichlor 40 SWG, 2006 Taylor Test Kit with Speed Stirrer
    1.5 HP Pump

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