What Is Causing My Ph To Increase?

  1. T

    ToRo Valued Member Member

    I have two separate tanks, the water from the tap going in is around 7.1 - 7.2. In testing the water from the tank the ph is it is 8.2. The only common denominator is that I use Prime and have the same filter media - Fluval biomax and activated carbon, along with a sponge filter. Could anyone tell me if any of that will increase the ph?
     
  2. clk89

    clk89 Fishlore VIP Member

    Did you off gas the tap water before testing it's PH? By off gas I mean letting it sit for at least 24 hours.
     
  3. Anders247

    Anders247 Fishlore Legend Member

    Agreed with clk89, that is probably what is causing the difference in pH reading.
     


  4. OP
    OP
    T

    ToRo Valued Member Member

    Yes, I put Prime in it and let it set overnight before water changes. I tested before the water change.
     
  5. clk89

    clk89 Fishlore VIP Member

    What kind of substrate do you use? Any decor in these tanks?
     
  6. Anders247

    Anders247 Fishlore Legend Member

    Do you have any rocks in the tank?
     


  7. OP
    OP
    T

    ToRo Valued Member Member

    The larger tank has a big piece of driftwood! :) Along with some river rock, sand, small gravel and regular sized gravel and is planted. All parameters are good - nitrates about 10ppm.
    The smaller tank has regular gravel, a plastic decoration and is planted - no sand or smaller gravel. Parameters are good in it as well with nitrates running about the same.
     
  8. Anders247

    Anders247 Fishlore Legend Member

    Try testing the river rock with vinegar, if it fizzes, then it is changing your pH.
     
  9. OP
    OP
    T

    ToRo Valued Member Member

    Done... no fizzing :/

    I believe it is the activated carbon that I am using. I took water that had set over night and tested it, 7.2 - added an activated carbon bag that I use in my AQ's and this morning the ph in that test was 8.2. Is there a different type of carbon that I can try in my filters?
     
  10. Anders247

    Anders247 Fishlore Legend Member

    That's weird, never heard of those raising the pH. You don't need it anyway though, so just stop using it.
     
  11. OP
    OP
    T

    ToRo Valued Member Member

  12. DoubleDutch

    DoubleDutch Fishlore Legend Member

    Plants using CO2 ?
     
  13. OP
    OP
    T

    ToRo Valued Member Member

    Plants but no CO2
     
  14. DoubleDutch

    DoubleDutch Fishlore Legend Member

    No I meand plants using CO2.
     
  15. OP
    OP
    T

    ToRo Valued Member Member

    I guess I thought all plants used CO2 (?) I have anubias, crypt, val, and blyxa

    Will remove them and see what happens ;) Thanks