This site is supported by the advertisements on it, please disable your AdBlocker so we can continue to provide you with the quality content you expect.
  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. Unfortunately for Photobucket users, things have changed in a big way as of June 26th they are rolling out a $399 per year subscription fee for those who want to hotlink images from Photobucket’s servers to display elsewhere.
    This does not mean it only affects this site, It now means that billions of images across the Web now display an error message instead of the image in question. :(
    https://barrreport.com/threads/attention-photobucket-users.14377/
    Dismiss Notice

pH of 8.0 at night...

Discussion in 'General Plant Topics' started by TexasRock, Jun 8, 2006.

  1. TexasRock

    TexasRock Prolific Poster

    Joined:
    May 31, 2006
    Messages:
    45
    Likes Received:
    0
    OK, I need some help here... what can I do to get my pH lower in my tank?

    During the day I can get it 7.3 sometimes 7.2.

    I am building a new reactor as soon as my mag 3 pump comes in... the mag 3 will be a dedicated pump that will drive my reactor. The output of the reactor will be going into the intake of my return pump from the sump.

    My sump has no bio balls, drip plate, etc... I use a 100 micron filter sock to catch the big stuff and a dual sponge filter for the bio load.

    Any ideas???

    Thanks!

    Keith
     
  2. Tom Barr

    Tom Barr Founder
    Staff Member Administrator Social Group Admin

    Joined:
    Jan 23, 2005
    Messages:
    18,462
    Likes Received:
    328
    Re: pH of 8.0 at night...

    What's the KH?

    Reducing that will reduce the pH.

    Regards,
    Tom Barr
     
  3. TexasRock

    TexasRock Prolific Poster

    Joined:
    May 31, 2006
    Messages:
    45
    Likes Received:
    0
    Re: pH of 8.0 at night...

    Tom,

    I wrote my city water quality lab and had them email me the latest water test, here are the results.

    Sample Date: May 15, 2006
    CONSTITUENT
    Unit of
    Measure
    TAP
    Total Alkalinity CaCO3 mg/L 130
    Total Hardness CaCO3 mg/L 472
    Total Hardness in Grains CaCO3 Grains 28
    pH Hydrogen Ion SU 7.48
    Calcium Ca+2 mg/L 98.1
    Magnesium Mg+2 mg/L 55.3
    Sodium Na+1 mg/L 219.5
    Sulfate SO4-2 mg/L 339
    Chloride Cl- mg/L 330.8
    Bicarbonate HCO3- mg/L 158.6
    Ammonia Nitrogen NH3-N mg/L 0.798
    Nitrate Nitrogen NO3--N mg/L 0.951
    Aluminum Al+3 mg/L 0.1
    Fluoride F- mg/L 0.46
    Ortho-Phosphate PO4-3 mg/L 0.16
    Iron Fe+2 mg/L 0.02
    Total Dissolved Solids TDS mg/L 1204

    By the looks of this, my tap water has a HIGH KH... what do you think? As you can see, the tap water has a normal pH of 7.48.

    Keith
     
  4. VaughnH

    VaughnH Lifetime Charter Member
    Lifetime Member

    Joined:
    Jan 24, 2005
    Messages:
    2,891
    Likes Received:
    21
    Re: pH of 8.0 at night...

    What reason do you have for wanting a lower pH? Plants and fish will do ok with what you have, except for rare exceptions. Lowering KH isn't nearly as easy as raising it - you can mix RO water with tap water to do so, but if there is no good reason to do so, why bother?
     
  5. TexasRock

    TexasRock Prolific Poster

    Joined:
    May 31, 2006
    Messages:
    45
    Likes Received:
    0
    Re: pH of 8.0 at night...

    VaughN,

    I got the impression that an indication of your CO2 saturation in the tank would be lower pH.

    My pH goes from 8.0 (degassed tank at night) to about 7.3-7.4 during the day. I see MINIMAL pearling on plants and I'd like to see more pearling because isn't that an indication that they are growing well or am I misunderstanding that?

    Keith
     
  6. Tom Barr

    Tom Barr Founder
    Staff Member Administrator Social Group Admin

    Joined:
    Jan 23, 2005
    Messages:
    18,462
    Likes Received:
    328
    Re: pH of 8.0 at night...

    There's a trend afoot to lower the pH using only CO2 gasd by 1.0 pH units to get ~ 25-30ppm.

    So if the water is 8.0, then you need to knock the pH down to 7.0.

    Your KH is 130ppm or about 7, moderately hard, not too bad.
    You could cut it 50/50 and get a KH of about 3-3.5 etc.

    Do not concern yourself so much pH.
    Use it to determine the CO2 is all.

    CO2 and KH are more important than a particular pH.


    Regards,
    Tom Barr
     
  7. TexasRock

    TexasRock Prolific Poster

    Joined:
    May 31, 2006
    Messages:
    45
    Likes Received:
    0
    Re: pH of 8.0 at night...

    OK, just for fun I tested my pH probe in the 7.00 pH solution that you use to calibrate. It came out to 7.4... so I recalibrated my probe. Now I will see what my pH reads. That should bring it down from the 8.0 reading to 7.6... which would mean I'd end up around 6.8 or so during the day.

    Keith
     
Loading...

Share This Page