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Thread: Plaster staining questions

  1. Back To Top    #1

    Join Date
    Jul 2011
    Mesa Arizona

    Plaster staining questions

    I had some stains in my pool and someone on here said to apply a dichlor puck to the stain so I tried it and it worked great on most of the stains.
    There are a few stains that it didn't work on. Small, circular dark stains. I'm going to try vitamin C on those and see what happens.
    Anyway, it's an older pool and the plaster has always had dark splotches on it in places but I thought those were permanent but when I removed the puck from those small, circular stains, I noticed that the puck cleaned the plaster very nicely. I also noticed that the surface is much smoother as well as cleaner where the puck had been sitting.
    I can't use pucks to clean all the splotches because it would take a year so any ideas on what I can do????
    I'll see if I can post some pictures tomorrow.
    Mesa Arizona. Old school 26,000 gallon in ground plaster pool with sand filter built in 1984.

  2. Back To Top    #2

    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: Plaster staining questions

    The pucks are Trichlor, not Dichlor (which is always a granulated powder). Trichlor is acidic and a high chlorine level so works particularly well on bleaching out and oxidizing organic stains. It's not the best approach for metal stains. To handle organic stains overall in a pool, usually they will just fade over time from maintaining chlorine levels but will fade faster at shock levels. For metal stains, one can use ascorbic acid (Vitamin C) and do a whole-pool treatment as described in Metals in the Water and Metal Stains.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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