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Thread: Pool turns green when adding water from my well

  1. Back To Top    #1

    Join Date
    Jul 2014
    Location
    Hopkinton, MA
    Posts
    28

    Pool turns green when adding water from my well

    Hi All,

    I've browsed these forums regularly for the past few years when I bought a house with a pool, but this is the first time I've needed to post looking for advice.

    This year I have just started having problems with my water turning green whenever I top off the pool with water from my well. I have never had this problem before. The main thing that has changed from previous years is I installed a SWG last August. The water doesn't turn cloudy, it just gets a green tint. The amount of green is proportional to the amount of water I added. Adding a 1/4 inch to the pool turned it a light green for about 2 days. I just recently added about 1" and it started turning green while I was adding the water (over a 4 hour period).

    I checked all my levels before and after adding the 1" of water this time

    Starting:

    Total Hardness: 260ppm
    Total Chlorine: 4ppm
    Free Chlorine: 4ppm
    PH 7.6
    Total Alkalinity: 130ppm
    CYA: 60ppm

    After water turned Green:

    Total Chlorine: 3ppm
    Free Chlorine: 3ppm
    all the rest were unchanged.

    The pool is still green 48 hours later. The TC/FC are back up at 4ppm.

    Based on what I have read on this site, I was suspecting this was metal in the water, though the last time I had my well water tested, it had no measurable iron in it. Just now I notice a little bit of brownish/yellow patches clinging to the walls of the pool. Algae? Could algae be coming in with the water and it just takes the chlorine in the pool a little while to kill it? What can I do to keep the pool from turning green whenever I add water?

    Thanks!
    ~26K Gallon, Gunnite IG, Hayward S270T Sand Filter, Hayward Super Pump w/ Ecotech EVSJ3 VS Motor
    Circupool RJ45 SWG, Dolphin S200 robotic cleaner, Rheem 400K BTU Propane Heater, 80sqft solar heater array

  2. Back To Top    #2
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Pool turns green when adding water from my well

    Welcome to TFP!

    Sounds like you are adding metals from the well reacting with the chlorine. Are you using sequestrants?
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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  3. Back To Top    #3

    Join Date
    Jul 2014
    Location
    Hopkinton, MA
    Posts
    28

    Re: Pool turns green when adding water from my well

    Quote Originally Posted by jblizzle View Post
    Welcome to TFP!

    Are you using sequestrants?

    Thanks! I'm not using any sequestrants. I would not expect the metal content of my well water to change significantly from year to year, so I am confused about why this is just now a problem. Could it be that previous years before the SWG I was running a lower FC and CYA and their levels were low enough to prevent this reaction. Could the salt in the pool react with the metals?
    ~26K Gallon, Gunnite IG, Hayward S270T Sand Filter, Hayward Super Pump w/ Ecotech EVSJ3 VS Motor
    Circupool RJ45 SWG, Dolphin S200 robotic cleaner, Rheem 400K BTU Propane Heater, 80sqft solar heater array

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