Water hardness higher from water heater than cold water line?

Discussion in 'Water Softener Forum, Questions and Answers' started by bigpak, Mar 19, 2021.

  1. bigpak

    bigpak New Member

    Joined:
    Mar 19, 2021
    Location:
    Missouri
    Hello, we just had our new addition to our house built, and we had a charcoal tank, and a water softener added, along with two new water heaters.
    I’ve used a hach-5B kit to test the water, and we have 0 GPG of hardness on our cold water, but around 2-4 on the other water heaters. The water heaters were never filled with hard water, only softened water. They have been drained several times.

    Any idea why the hot water is harder than cold water? Thanks for your time
     
  2. WorthFlorida

    WorthFlorida The wife is still training me.

    Joined:
    Oct 28, 2009
    Occupation:
    Retired
    Location:
    Orlando, Florida
    Was the water warm or at room temperature when tested? Test several times on both hot and cold to get an average to eliminate any false test.

    How old are the water heaters. Regardless of hardness tests, at times some hardness sneaks through before regen occurs. Minerals will always deposit on the bottom of a water heater but with soft water it will never be an issue as with hard water.
     
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  4. bigpak

    bigpak New Member

    Joined:
    Mar 19, 2021
    Location:
    Missouri
    the water was fairly warm, about 110 degrees if I had to guess

    every time I test on cold it’s always 0, and depending on which water heater it is 2-4. Could it be the anode that is adding hardness by any chance?
     
  5. Reach4

    Reach4 Well-Known Member

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    Sep 25, 2013
    Location:
    IL
    Never? They were not in service before you installed the softener?
     
  6. bigpak

    bigpak New Member

    Joined:
    Mar 19, 2021
    Location:
    Missouri
    Correct, I made sure that the water softener was installed and functioning and that soft water was coming out before the water heaters were plumbed in.
     
  7. water pro

    water pro Active Member

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    Nov 11, 2020
    Location:
    syracuse
    your not regenerating frequently enough.
     
  8. bigpak

    bigpak New Member

    Joined:
    Mar 19, 2021
    Location:
    Missouri
    I’ve tested the cold water everyday during its 13 days until it Regens, and always was 0 GPG. It’s a real headscratcher
     
  9. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    Some residual hardness materials could be in the hot pipes. Adding 3 grains of hardness seems surprising from that.
     
  10. LLigetfa

    LLigetfa DIYer, not in the trades

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    NW Ontario, Canada
    I don't know if the temperature will skew the results but suggest you chill the water and test again.

    I envy your 11 GPG and wonder why even bother with a softener. Mine is 75 GPG.
     
  11. water pro

    water pro Active Member

    Joined:
    Nov 11, 2020
    Location:
    syracuse
    shorten the regen to 11 days then test after 2 days
     
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