Low PH

Discussion in 'Water Parameters and Additives' started by brentnorm, 12 Jul 2008.

  1. brentnorm

    brentnorm

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    What is considered a low and dangerous PH ? I bought a Milwalkee PH600 pen today and tested my water, it was 7.9 earlier today and I just checked now and it shows 7.5 Did a test with my seachem test kit and the water does not even change colour. Did the reference test on the seachem kit and it is fine.
     
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  3. Mekaeel

    Mekaeel Moderator MASA Contributor

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    Have you caliberated the Ph pen Brent?
     
  4. brentnorm

    brentnorm Thread Starter

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    Yip, first thing I did
     
  5. Mike

    Mike Retired Moderator

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    normal PH is 8 to 8.5 after lights out the PH can drop a little, i don't think 7.9 is dangerous, but if you ran a kalkwasser top up over night (i.e. only top up at night using a kalkwasser mix) it is supposed to keep the PH stable.
     
  6. Shaun

    Shaun Retired Moderator

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    Please remember if the head was dry you need to soak it for a couple of hours, then check calibration. Don't let the head get dry as it will mess with the readings.
     
  7. Mekaeel

    Mekaeel Moderator MASA Contributor

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    Also keep in mind,a ph of 7.7 is still safe. (rather shocking level though)
     
  8. brentnorm

    brentnorm Thread Starter

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    Checked again this morning abd its now 8.1 both with the pen and the seachem test kit. Have put in some more reef carbonate.
     
  9. Mekaeel

    Mekaeel Moderator MASA Contributor

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    Just leave it for a while and monitor, dont dose anything.Check ph just before lights go out and check up again before lights come on.
     
  10. brentnorm

    brentnorm Thread Starter

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    Ok, will monitor for a couple of days.
     
  11. Mekaeel

    Mekaeel Moderator MASA Contributor

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    Are you running a Calcium reactor Brent?
     
  12. brentnorm

    brentnorm Thread Starter

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    nope, nhing like that. I dose eerything manually
     
  13. Mekaeel

    Mekaeel Moderator MASA Contributor

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    In the meantime keep on checking and give us the lowest ph reading you get.
     
  14. Reef Maniac

    Reef Maniac MASA Contributor

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    I don't know this device - can you please explain how you calibrated it (one or two point calibration, what buffers were used, procedure...)

    Excellent advice. Best is to keep the electrode submerged in KCl, but pH 4 or pH 7 buffer solution will also work very well - just NEVER keep it in RO water.

    Hennie
     
  15. brentnorm

    brentnorm Thread Starter

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    I got some PH7 solution with the deice and there is a small screwdriver to set the unit to PH7
     
  16. Reef Maniac

    Reef Maniac MASA Contributor

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    So then it would appear to have only a one-point calibration - not ideal, as one would also like to calibrate it at either a high (pH 10) or low (pH 4) level to ensure maximum accuracy. I would suggest that you either make a borax solution (3.8 grams of borax dissolved into 1 liter of RO water = pH 9.18 at 25°C) or use a pH 10.01 standard buffer to confirm that the instrument is actually reading correct.

    Hennie
     
  17. sunburst

    sunburst

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    If both are giving the same reading, then the chances are that the pen is correct.

    What is Reef Carbonate? And why are dosing? By trying to raise your pH using buffer is not advisable.
     
  18. brentnorm

    brentnorm Thread Starter

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    Reef Carbonate is a seachem product I dose with. Here is a write up.

    Reef Carbonate™ is a concentrated (4,000 meq/L) optimized blend of carbonate and bicarbonate salts designed to restore and maintain alkalinity in the reef aquarium. Calcium and carbonates are essential to all coral growth. If either becomes deficient, coral growth will cease, followed by a rapid decline in coral health. To prevent this you must provide carbonates (Reef Carbonate™) and calcium (Reef Advantage Calcium™ or Reef Complete™).
    Used as directed, Reef Carbonate™ will not deplete calcium, magnesium, or strontium which usually tend to precipitate with increasing alkalinity. Reef alkalinity should be maintained at 3–5 meq/L (8–14 dKH). Alkalinity should not be allowed to fall below 2 meq/L.
     
  19. Mekaeel

    Mekaeel Moderator MASA Contributor

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    I would stop all dosages for now, and do as Hennie mentioned.
     
  20. brentnorm

    brentnorm Thread Starter

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    ok, I will try that out. Thanks
     
  21. sunburst

    sunburst

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    This is a buffer. It does not supply calcium. So before you do anything else measure your calcium and alkalinity, and identify the shortfall. Then dose accordingly, to restore the imbalance.
     
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